How much is a 13-carat natural diamond? Where to buy it reputably?
Key Takeaways
- 13 carat diamonds are among the rarest precious stones, highly sought after by the elite and collectors. With their large weight, impressive size, and stable investment value, each 13-carat diamond not only...
13 carat diamonds are among the rarest precious stones, highly sought after by the elite and collectors. With their large weight, impressive size, and stable investment value, each 13-carat diamond not only brings luxurious beauty but also symbolizes power and class.
In this article, diamond expert Jemmia will guide you through the details of weight, size, market value, and reputable places to buy 13-carat diamonds.
How many millimeters is a 13-carat diamond, and how much does it weigh in grams?
According to GIA (Gemological Institute of America) international standards:
- By international convention, 1 carat = 0.2 grams. Therefore, 13 carats is equivalent to 2.6 grams.
- With a standard round cut (Round Brilliant Cut), a 13-carat diamond has an approximate diameter of 15.6 millimeters (~15.6 mm).
Note: The size can vary depending on the cutting proportions, depth, and shape of the cut (Oval, Emerald, Pear, etc.). 13-carat diamonds are among the rarest gemstones, typically found only in high-end jewelry collections or at international auctions.
A 13-carat diamond is equivalent to 2.6 grams and 15.6mm
How much does a 13-carat diamond cost?
13-carat diamonds fall into an extremely high-value segment. With a size of 15.6mm and a weight of 2.6 grams, each diamond can cost from hundreds of thousands to millions of US dollars.
According to the Diamond Price Index® (2025), the average price of natural diamonds of 5 carats and above is $21,997 per carat.
Thus, the estimated price of a 13-carat diamond is: 13 × $21,997 ≈ $286,000, equivalent to 7,293,000,000 VND.
However, the actual price may vary depending on:
- Diamond Color: D (colorless) will have the highest value.
- Clarity: from Flawless to Included.
- Diamond Cut: Directly determines brilliance and commercial value.
- Diamond Certification: GIA is a reputable standard to ensure the stone's value.
In reality, 13-carat diamonds meeting the highest standards (D Color, IF, Excellent Cut, GIA certified) can be valued at over $1 million in international auctions.
A high-standard 13-carat diamond can cost up to $1 million
See more: How to test real or fake diamonds
How much does a 13-carat diamond ring cost?
When crafted into a ring, the value of a 13-carat diamond will increase many times over, influenced by:
- The quality of the 4Cs
- Design style
- Ring metal material
- Quality and quantity of small diamonds
- Manufacturing brand
In the market, a ring set with a 13-carat diamond can range from $500,000 to over $1.5 million, depending on the 4Cs quality and brand. For stones with perfect color and clarity, the value can exceed $2 million.
Where to buy reputable and quality 13-carat diamonds?
Given their immense value and rarity, choosing a place to buy 13-carat diamonds requires careful consideration. In Vietnam, Jemmia Diamond is a brand trusted by many customers for its reputation and transparency in sales.
Why choose Jemmia Diamond?
- 100% officially imported diamonds: With full invoices and GIA certificates, ensuring legal compliance.
- Select only the top 2% of the world's finest diamonds: Rigorous selection according to the 4Cs standards.
- Utilizes international standard inspection technology: Systems like GIA iD100, GIA Diamond Dock, GIA Match iD… allow customers to verify directly.
- Ethical diamonds: Imported from countries adhering to the Kimberley Process, with transparent origins, not mined from conflict zones.
- Transparent pricing: Publicly available, easy to search and select according to budget.
- Competitive buy-back/exchange policy: Providing peace of mind for long-term investment or product upgrades.
Jemmia Diamond diamonds are officially imported through customs, ensuring transparent origin
See more:
- How Much Does a 3.5mm Diamond Cost?
- What is the Current Price of a 6.5mm Diamond?
- The 4Cs of Diamonds: International Quality Standards from GIA
13-carat diamonds are symbols of luxury, power, and a statement of class. With a weight of 2.6 grams, a diameter of nearly 16mm, and prices ranging from hundreds of thousands to millions of US dollars, this is an extremely rare product category, typically found only in the collections of the ultra-rich and at international auctions.
