Visit a Specialized Purchase Store OTAKARAYA
to Appraise and Sell Your Diamonds
At OTAKARAYA, we are actively purchasing various diamond jewelry, including rings and necklaces, at high prices.
Our expert appraisers accurately assess the quality of your diamonds to offer a satisfying price.
Diamond Reference Purchase Price Chart
Customers who have a certificate of appraisal or those who know the 4Cs of their item.
Simulate the reference purchase price from the list below.
Diamond Reference Purchase Price Chart
- Notes
- The price is tax included.
- The grade of the diamond may vary depending on the certification institution that issued the certificate.
- The prices listed are for Round Brilliant Cut diamonds.
- The price list is for reference only and does not guarantee the purchase price.
- Diamonds with an FL clarity are generally not available on the second-hand market, so they are not listed in the price table.
- Diamonds with a color grade of N or higher are treated as fancy colored diamonds, and the price will be handled on an individual basis.
How to Read the Reference Purchase Price Chart
How to Read the Reference Purchase Price Chart
GOOD
- Gemstones only
- Decorated with Gold Jewellery
Please refer to the 4Cs listed on the certificate and check the reference purchase prices in the table below.
Even without a certificate, we will still make a purchase, so please feel free to contact us.
※The simulation is based on the assumption that the color is 'D', clarity is 'IF', and cut is '3EX'.
Please refer to the 4Cs listed on the certificate and check the reference purchase prices in the table below.
Even without a certificate, we will still make a purchase, so please feel free to contact us.
※The simulation is based on the assumption that the color is 'D', clarity is 'IF', and cut is '3EX'.
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Jewealry Reference Purchase Prices
Please note that the reference purchase prices may fluctuate depending on the timing and market conditions. Feel free to contact us for more information.
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The Latest Jewelry Purchase Items
Every day, we purchase numerous Jewelry, and we introduce one carefully selected item daily.
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Points for High-Value Diamond Purchase and Appraisal
Many people know that the value of a diamond is determined by its carat weight. However,
its value is also influenced by the other 4Cs: cut, clarity, and color.
Additionally, factors such as brand, design, condition, and the presence of accessories
can also impact its value. At OTAKARAYA, we not only evaluate the 4Cs but also carefully
assess these additional factors to offer the highest possible purchase price.
Factors That Determine the Value of a Diamond
Carat
Carat is a unit of weight for gemstones, and 1 carat (ct) is equivalent to 0.2 grams. In the case of diamonds, certificates issued by domestic gemological and appraisal institutions provide precise measurements up to three decimal places, although in general transactions, it is often rounded to two decimal places.
As the carat weight increases, the rarity of the gemstone also increases, causing its price to rise significantly. Even with diamonds of the same quality, when the carat weight doubles, the price does not necessarily double. Especially for round figures like 0.5ct or 1.0ct, the price tends to rise sharply.
In the ideal cut of a round brilliant cut, the relationship between carat weight and size is as follows: A 0.1ct diamond has a diameter of approximately 3.0mm, a 0.5ct diamond is about 5.2mm, and a 1.0ct diamond measures around 6.5mm.
Cut
Cut is a crucial factor in maximizing a diamond's brilliance. A diamond with an excellent cut reflects light effectively, producing a beautiful sparkle. The cut is evaluated on a scale from 'Excellent' to 'Poor' in five grades.
The evaluation is divided into two categories: 'Proportion' and 'Finish.' Proportion refers to the size, ratio, and angles of the facets in a round brilliant cut. There is an 'ideal shape' for this cut that maximizes brilliance, and diamonds are classified into five grades based on how close they come to this ideal.
Next, Finish is further divided into 'Polish' and 'Symmetry.' Polish evaluates the quality of the diamond's polish, while Symmetry assesses the arrangement and symmetry of the facets, both on a fivegrade scale.
In this way, the cut evaluation is done based on 'Proportion,' 'Polish,' and 'Symmetry.' Diamonds that receive the highest rating of 'Excellent' in all these areas are particularly referred to as '3EX' (Triple Excellent). Additionally, diamonds that meet certain criteria may exhibit a 'Hearts and Arrows' pattern, a feature seen in diamonds with the 'Heart & Cupid' trademark.
Diamonds with '3EX' or 'Hearts & Arrows' are considered the highest grade, with their brilliance easily visible to the naked eye and receiving high acclaim for their exceptional cut.
Clarity
Diamonds typically contain minute inclusions (internal characteristics) or surface blemishes. The extent of these inclusions and surface features is evaluated as 'clarity.' Skilled gemologists use a 10x loupe to inspect the diamond, and based on the severity of these characteristics, the clarity is ranked in 11 levels.
Clarity is graded from the highest transparency, 'FL' (Flawless), to the lowest, 'I3', as follows.
FL (Flawless): No inclusions or blemishes are visible under 10x magnification, even by a skilled gemologist.
IF (Internally Flawless): No inclusions are visible under 10x magnification; only minor blemishes are detected.
VVS1/VVS2 (Very, Very Slightly Included): Inclusions are extremely difficult to detect under 10x magnification.
VS1/VS2 (Very Slightly Included): Minor inclusions are visible under 10x magnification.
SI1/SI2 (Slightly Included): Inclusions are clearly visible under 10x magnification.
I1/I2/I3 (Included): Inclusions are visible under 10x magnification or even to the naked eye, significantly affecting the diamond's clarity.
Clarity grading is not determined solely by the size of the inclusions, but takes into account various factors such as the number, location, type, visibility, and color of the inclusions.
Color
Diamonds are graded for color on a scale from D to Z. The grading starts with D, which represents diamonds that are closest to colorless, and the scale progresses as the diamond's color deepens, ultimately reaching Z. The closer a diamond's color is to D, the higher its value, and the more pronounced the color, the lower its grade tends to be.
This color grading of the 4Cs mainly applies to yellow and brown hues. Diamonds with other colors, such as pink or blue, are referred to as 'fancy colored diamonds' and are evaluated based on different criteria rather than the 4Cs. If a diamond's color exceeds Z, it is also classified as a fancy colored diamond.
In general, diamonds with yellow or brownish hues are considered less valuable, but once they reach the level of fancy colored diamonds, their rarity can increase their value. As a result, yellow diamonds with a color deeper than Z can often trade for more than colorless D diamonds due to their scarcity.
Additionally, you may have heard that a diamond's 'fluorescence' can affect its color grading. However, this has little actual impact on the grade. Fluorescence refers to the bluish glow emitted by a diamond when exposed to ultraviolet light. Since the 4C color grading is based on yellow tones, fluorescence can affect the appearance of the diamond's color. However, unless the fluorescence is extremely strong, it doesn't significantly influence the overall grade.
The criteria for evaluating diamonds?
Regarding the quality evaluation of diamonds.
Diamonds are evaluated based on four criteria: carat (weight), cut (polishing technique), clarity (transparency), and color. Among these, "cut" is the only criterion that is influenced by human craftsmanship, and it is a crucial factor in determining the diamond's brilliance, depending on the quality of the technique.
Regarding diamond treatments and processing.
Diamonds are generally not subject to any human treatments other than cutting and polishing. However, some diamonds may undergo treatments to improve their clarity or color. At OTAKARAYA, we strive to evaluate your items to the fullest extent, so please feel free to show us any items you're unsure about.
Regarding the origin of diamonds.
Diamonds are mined in various countries around the world, with prominent countries including Russia, Botswana, and Canada. The value and quality of diamonds are generally considered not to vary based on their origin. However, diamonds mined from the Jwaneng mine in Botswana are often regarded as being of the highest quality. As of 2023, there are only 10 companies globally involved in diamond mining.
About the Colors of Diamonds with High Purchase Appraisal Value
Colorless Diamonds
Diamonds are evaluated based on the 4Cs, and their value increases the larger, clearer, and more transparent they are.
Red Diamonds
Red diamonds are the rarest and most valuable among colored diamonds. Their color is ranked as follows: Fancy Red, Fancy Purplish Red, and Fancy Orangy Red, in descending order of value.
Blue Diamonds
Blue diamonds are the second most highly valued after red diamonds. They are occasionally mined in the Premier Mine in South Africa. Diamonds with vivid colors, free from pale or grayish hues, are considered superior.
Green Diamonds
Green diamonds are extremely rare and highly valued. Among them, those with high saturation, such as "Fancy Intense Green" and "Fancy Vivid Green," fetch premium prices.
Purple Diamonds
Purple diamonds come in a range of shades from light to deep hues. The deeper and more distinct the color, the higher the value.
Pink Diamonds
Pink diamonds are considered one of the most valuable colored diamonds due to their limited supply.
Orange Diamonds
Orange diamonds are highly prized for their rarity and are generally valued more than standard colored diamonds.
Yellow Diamonds
Yellow diamonds are relatively abundant. However, those with canary or lemon-like hues, free from orange undertones, are considered the most valuable.
Brown Diamonds
Brown diamonds come in various shades, such as reddish-brown or yellowish-brown, with varying levels of saturation. They are widely used in different types of jewelry due to their availability, and their resale value often depends on the design.
Black Diamonds
Black diamonds are characterized by inclusions of iron or graphite spread throughout the stone. Natural black diamonds are extremely rare, and the deeper and richer the black color, the higher their value.
Points for
High-Value Diamond Purchase and Appraisal
Additionally, factors such as brand, design, condition, and the presence of accessories can also impact its value. At OTAKARAYA, we not only evaluate the 4Cs but also carefully assess these additional factors to offer the highest possible purchase price.
Factors That Determine the Value of a Diamond
The criteria for evaluating diamonds?
About the Colors of Diamonds with High Purchase Appraisal Value
What is a
Shaped Diamond ?
Fancy-shaped diamonds refer to all diamond cuts other than the round brilliant cut, which is known for its classic round shape. While the round brilliant cut remains the most popular and traditional choice, many diamonds are crafted into unique and stylish fancy shapes. Below are some examples of these fascinating fancy-shaped diamonds.
Visit Otakaraya to Sell Your Jewelry
01 The staff includes holders of the GG (Graduate Gemologist) qualification.
The GG (Graduate Gemologist) qualification is a prestigious gemologist certification awarded by the Gemological Institute of America (GIA), recognized globally as one of the most authoritative credentials. At Otakaraya, we have staff members who hold the GG qualification, and we also provide regular gemologist training through our in-house educational program. As a result, we are capable of performing highly accurate and high-level assessments of all types of gemstones.
Rika Iwamatsu
Profile
：Started working at a gemological laboratory and has been involved in diamond grading and gemstone identification for nearly 30 years.
Qualifications：GG (Graduate Gemologist) - obtained in May 1994
Hometown：Tokyo
Hobbies：Traveling
02 Latest appraisal equipment of Otakaraya
UV-Visible Near-Infrared Spectrophotometer
When visible light (light that can be seen by the human eye) passes through a substance, some of the light is absorbed by the material. The UV-Visible Near-Infrared Spectrophotometer is excellent at analyzing the wavelengths of the absorbed light. At 'Otakaraya,' this instrument is used to inspect treatments applied to diamonds and the treatments on gold-based white pearls, allowing for accurate assessment of the gem's value.
Fourier Transform Infrared Spectrophotometer
The Fourier Transform Infrared Spectrophotometer is a precision instrument that analyzes samples by shining infrared light onto them and measuring the transmitted or reflected light. At 'Otakaraya,' this equipment is used for a wide range of tests, including examining the presence of resin impregnation treatments in jade and conducting specific tests on diamonds.
Type I and Type II Determiner
The sample is placed inside the determiner, and ultraviolet light is applied to assess the diamond by its transmission rate. In just one second, the device can determine whether the diamond is Type I (natural diamond) or Type II (high-temperature, high-pressure treated diamond or synthetic diamond). The device can assess both loose diamonds and diamonds set in a setting, allowing for measurement without removing the stone from the setting. It provides quick and accurate evaluation without damaging your items.
Moissanite Determiner
After cleaning the surface of the gemstone, the probe is applied to the sample. The electrical conductivity measured by the device is used to determine whether the stone is a diamond or moissanite. Similar to the Type I and II determiner, it provides instant and accurate assessments.
03 Evaluation of Design and Brand Value
At Otakaraya, we not only assess the intrinsic value of the gemstones themselves but also take into account the brand value and design when determining the appraisal value. We ensure that even small gemstones are thoroughly evaluated, and we can offer a purchase regardless of whether the item has accessories or a box.
04 All Fees Are Free for Purchase
Appraisal fee is completely free, with no burden placed on the customer. We offer a variety of purchasing methods, including, in-store, and email appraisals.
05 Network of Over Stores Worldwide
A boasts over stores worldwide, the largest number among purchasing stores. If you bring your item to a nearby Otakaraya store, you can receive immediate cash payment. Additionally, Otakaraya has a proven track record of transactions with 44 countries worldwide, handling large-scale transactions not only with individuals but also with corporations and businesses. In addition to diamonds, Otakaraya also purchases a wide range of gemstones, including rubies, sapphires, and more.
Visit OTAKARAYA
to Sell Your Diamonds
The staff includes holders of the GG (Graduate Gemologist) qualification.
At OTAKARAYA, we have staff members who hold the GG qualification, and we also provide regular gemologist training through our in-house educational program.
As a result, we are capable of performing highly accurate and high-level assessments of all types of gemstones.
Latest appraisal equipment of OTAKARAYA
Evaluation of Design and Brand Value
We ensure that even small gemstones are thoroughly evaluated, and we can offer a Purchase regardless of whether the item has accessories or a box.
All Fees Are Free for Purchase
Network of Over Stores worldwide
If you bring your item to a nearby OTAKARAYA store, you can receive immediate cash payment.
Additionally, OTAKARAYA has a proven track record of transactions with 44 countries worldwide, handling large-scale transactions not only with individuals but also with corporations and businesses.
In addition to diamonds, OTAKARAYA also purchases a wide range of gemstones, including rubies, sapphires, and more.
About Diamond Certificates
What are certificates and identification reports?
A certificate or identification report is provided when purchasing a diamond, detailing the origin and type of the diamond. If you have it, please bring the certificate or identification report when selling the diamond.
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- 1 Cut and Shape
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The diamond's shape and facet arrangement are described.
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- 2 Weight (Carat)
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The weight is evaluated as 1 carat = 0.2g (200mg).
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- 3 Color Grade
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The diamond's color intensity is evaluated using the GIA Master Stone (JJA/AGL certified) in grades from D to Z.
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- 4 Clarity Grade
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The number, size, color, and location of inclusions in the diamond are evaluated in grades such as FL, IF, VVS1–VVS2, VS1–VS2, SI1–SI2, I1–I2.
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- 5 Cut Grade
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Using the GIA Facetware Cut Estimator database and visual assessment, the cut is graded as Excellent, Very Good, Good, Fair, or Poor.
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- 6 Fluorescence
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The color and strength of fluorescence are evaluated using a fluorescence master stone in grades of None, Faint, Medium, Strong, or Very Strong.
ANY CONDITION!
Don't give up just because
it's
"BROKEN," "DIRTY" or "OLD"!
OTAKARAYA enchancing purchase offers
for Gemstones / Jewelry in any condition!
for PURCHASE!
We accept items
even if accessories such as
appraisal or authenticity
certificates are not included.
Cracks
Prominent
Scratches
Loose stones
Engraved
initials and dates
Introduction of Appraisers
Iwamatsu
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Hobbies
Travel
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Favorite phrase
Actions speak louder than words
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Favorite brand
Diamonds and Jewelry
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Past purchase examples
10-carat Diamond
At OTAKARAYA, we assess hundreds of gemstones every day, both large and small. The value of gemstones can fluctuate greatly depending on various factors such as the 4Cs of diamonds, color, shape, weight, and fluorescence. OTAKARAYA holds its own auctions, allowing us to respond quickly and sensitively to daily gemstone demand. Regarding assessments, we have professional staff and specialized tools such as diamond testers, enabling accurate evaluations at our stores worldwide If you're interested in any items, please feel free to use OTAKARAYA's services.
\ Many customers are using our service! /
B.S
★★★★★
Been here few time. Good appraisal high price, very patient and accommodating staff. Thanks for your assistance. Hope to deal with you again.
F.G
★★★★★
Very accommodating
I.B
★★★★★
Best appraisal, very professional, and very friendly appraiser. The shop office and the professional process is conducive for trust.
L.P
★★★★★
Very patient n professional in his job
W.S
★★★★★
Their staff was super friendly and helpful. Professional authentication assessment process & fast service. Took less than 30 mins for me!
V.C
★★★★★
Offered excellent service and a little wait is all worth it for a reasonable price in return. Thank you
※ The above evaluations are for reference only
9 Reasons Why You Can Sell Diamonds for High Value Here
Specialty Purchase Store OTAKARAYA with Over
Stores Worldwide
For years since our founding, we,
"OTAKARAYA", the industry's largest leader, are
proud to present 9 reasons why we offer
high-value purchases.
Professional Appraisals with Expertise
Our years of history have allowed us to accumulate unparalleled know-how!
Specialized Purchasing Stores
By being deeply rooted in local communities, we achieve high-value purchases!
Over Stores Worldwide
Worldwide Purchasing Expertise Centralized at Each Store!
Track Record of Global Transactions
With OTAKARAYA's Global Partnerships, We Offer World-Class Purchase Prices!
Wide Range of Items Accepted
With trade partners in multiple countries, we provide purchase prices that meet global standards!
Top-Tier Appraisal Environment
We discern the true value of your items and present purchase prices with confidence!
Free Appraisal, No Service Fee
We will cover all expenses!
High-Price Purchase Campaign
We strive to offer high-value purchases to ensure customer satisfaction!
Cost Reduction Through In-House Auctions
By minimizing sales costs, we can set higher purchase prices!
Types of Gemstones / Jewellery Items We Can Purchase at Otakaraya
Search by Gemstone and Colored Stone
Search by Jewelry Brand Name
Browse by Gold & Precious Metal Purchase Items
Frequently Asked Questions
about Diamonds Purchase
- When is the best time to sell diamonds?
- The best time to sell diamonds can vary. Sometimes, the right opportunity arises quickly, while at other times, holding onto them for a longer period can increase their value. It is difficult to pinpoint a universally ideal time. If you plan to keep your diamonds for a longer duration before selling, it is essential to store them properly. We recommend using appropriate storage methods and performing regular maintenance to preserve their condition.
- Can I sell diamonds without a certificate?
- Yes, you can. Our appraisers will evaluate the diamond 4Cs (Carat, Color, Clarity, and Cut) and provide you with a purchase price.
- Does the design affect the purchase price?
- For gemstone purchases, the grade of the diamond itself is crucial. Even with an older design, Otakaraya ensures a high-value purchase, so you can rest assured.
- Does the shape of the diamond affect the purchase price?
- Yes, the purchase price varies by shape. The "round brilliant cut" is the most highly valued cut for diamonds. The purchase price also changes depending on the diamond's grade, so feel free to take advantage of our free appraisal service.
- Do specialty gemstone purchase shops offer higher prices?
- At Otakaraya, we handle a wide range of items, including diamonds, gemstones, jewelry, gold, precious metals, branded items, and watches. This extensive sales network allows us to avoid holding excess inventory, enabling us to offer the highest possible prices for your items.
- Can melee diamonds (pavé diamonds) be purchased?
- Yes, they can be purchased. Jewelry adorned with melee diamonds (pavé diamonds) may receive a higher appraisal value. However, loose stones may not be eligible for purchase.
