How Much Is a 13-Carat Natural Diamond? Where Can You Buy One Reputably?
Key Takeaways
- 13-carat diamond is one of the ultra-rare gemstones, especially sought after by the elite and collectors. With its large weight, impressive size, and sustainable investment value, each 13-carat stone not only brings...
13-carat diamond is one of the ultra-rare gemstones, especially sought after by the elite and collectors. With its large weight, impressive size, and sustainable investment value, each 13-carat stone not only brings luxurious beauty but is also a symbol of power and class.
In this article, Jemmia diamond experts will help you explore in detail the weight, size, market value, and reputable places to buy a 13-carat diamond.
How many ly is a 13-carat diamond, and how many grams does it weigh?
According to the international standards of GIA (Gemological Institute of America):
- According to international standards, 1 carat = 0.2 grams. Therefore, 13 carats is equivalent to 2.6 grams.
- With the standard round cut (Round Brilliant Cut), a 13-carat diamond has an approximate diameter of 15.6 ly (~15.6 mm).
Note: The size may vary depending on cut proportions, depth, and cut shape (Oval, Emerald, Pear…). A 13-carat diamond belongs to the rarest group of gemstones, usually appearing only in high-end jewelry collections or international auctions.
13 carats is equivalent to 2.6 grams and 15.6 ly
How much does a 13-carat diamond cost?
A 13-carat diamond belongs to an extremely high-value segment. With a size of 15.6 ly and a weight of 2.6 grams, each diamond is priced from hundreds of thousands to millions of USD.
According to the Diamond Price Index® (2025), the average price of natural diamonds from 5 carats and above is 21,997 USD/carat.
Thus, the estimated price of a 13-carat diamond is: 13×21.997≈286.000 USD, equivalent to 7,293,000,000 VND.
However, the actual price may be higher depending on:
- Diamond color (Color): D (colorless) will have the highest value.
- Clarity (Clarity): from Flawless (no blemishes) to Included (contains inclusions).
- Diamond cut (Cut): Directly determines brilliance and commercial value.
- Diamond certificate: GIA is the reputable standard to ensure the stone’s value.
In reality, 13-carat diamonds that meet the highest standards (D Color, IF, Excellent Cut, GIA certified) can be valued at over 1 million USD in international auctions.
A high-standard 13-carat diamond can cost up to 1 million USD
See more: How to test whether a diamond is real or fake
How much does a 13-carat diamond ring cost?
When crafted into a ring, the value of a 13-carat diamond increases many times over, due to the influence of:
- 4Cs quality
- Design style
- Ring setting material
- Quality and quantity of melee diamonds
- Crafting brand
On the market, a ring set with a 13-carat diamond ranges from 500,000 USD to over 1.5 million USD, depending on the 4Cs quality and brand. For stones with perfect color and clarity, the value can exceed 2 million USD.
Where to buy a reputable and high-quality 13-carat diamond?
With its enormous value and rarity, choosing a place to buy a 13-carat diamond needs to be carefully considered. In Vietnam, Jemmia Diamond is a brand trusted by many customers thanks to its reputation and transparency in trading.
Why choose Jemmia Diamond?
- 100% officially imported diamonds: Full invoices and GIA documents are provided, ensuring legality.
- Only select the top 2% most beautiful diamonds in the world: Strictly selected according to 4Cs standards.
- Applying international-standard grading technology: GIA iD100, GIA Diamond Dock, GIA Match iD machine systems… help customers verify directly.
- Ethical diamonds: Imported from countries complying with the Kimberley Process, with transparent origins and not mined from war zones.
- Transparent pricing: Publicly available, easy to look up and choose according to budget.
- Competitive buyback-trade-in policy: Helps customers feel secure when making long-term investments or upgrading products.
Jemmia Diamond diamonds are officially customs-imported, ensuring transparent origin
See more:
- How Much Does a 3.5 Ly Diamond Cost?
- How Much Does a 6.5 Ly Diamond Cost Today?
- Diamond 4C Standards: International Standard Quality Assessment from GIA
13-carat diamond is a symbol of luxury, power, and class affirmation. With a weight of 2.6 grams, a diameter of nearly 16 ly, and a price ranging from hundreds of thousands to millions of USD, this is an extremely rare product line, usually appearing only in the collections of the ultra-rich and at international auctions.
