How much is a 16-carat natural diamond? Where to buy it reputably?
Key Takeaways
- A 16-carat diamond belongs to the super rare gemstone group, usually appearing only in high-end collections or at international auctions. With its large weight, superior size, and exceptional rarity, a 16-carat diamond...
A 16-carat diamond belongs to the super rare gemstone group, usually appearing only in high-end collections or at international auctions. With its large weight, superior size, and exceptional rarity, a 16-carat diamond is not only a luxury jewelry but also considered a sustainable investment asset for generations.
In this article, diamond expert Jemmia will explore with you the weight, size, selling price, as well as reputable places to buy 16-carat diamonds.
How many millimeters and grams is a 16-carat diamond?
According to the international standard of GIA (Gemological Institute of America):
- 16 carats = 3.2 grams (1 carat = 0.2 grams).
- For a standard round brilliant cut, a 16-carat diamond has an approximate diameter of 16.7 mm.
Note: The actual size may vary depending on the cutting proportions, depth, and shape of the cut (Oval, Emerald, Pear, etc.). With a weight of 3.2 grams and a diameter of nearly 17 mm, a 16-carat diamond is classified as extremely rare, possessing outstanding collectible and investment value.
A 16-carat diamond weighs approximately 3.2 grams
How much does a 16-carat diamond cost?
A 16-carat diamond is priced in the highest segment of the jewelry industry.
According to data from the Diamond Price Index® (2025), the average price of natural diamonds of 5 carats and above is approximately 21,997 USD/carat. Thus, the estimated price for a 16-carat diamond is:
16 × 21,997 ≈ 352,000 USD
In reality, the price of a 16-carat diamond can range from 420,000 USD to over 900,000 USD, depending on:
- Color: D color (colorless) achieves the highest price.
- Clarity: Flawless, VVS have superior value.
- Cut: Excellent helps the stone optimize light.
- International certificate: GIA is an important guarantee for determining value.
In auctions, many high-quality 16-carat diamonds have been traded for over 2 million USD.
The price of a 16-carat diamond can range from 420,000 USD to over 900,000 USD
How much does a 16-carat diamond ring cost?
A ring with a 16-carat diamond not only signifies luxury but also demonstrates power and social status. When crafted into a ring, the stone's value is increased by several factors:
- The quality of the main diamond's 4Cs.
- Design style: from simple (solitaire) to complex (halo, bespoke).
- Manufacturing material: 18K gold, platinum, small diamonds.
- Brand: reputable jewelers multiply the product's value.
On the international market, 16-carat diamond rings typically cost from 650,000 USD to over 2 million USD. For stones meeting D/VVS/Excellent standards and unique designs, the price can exceed 2.5 million USD.
Unique 16-carat diamond rings can cost up to 2.5 million USD
See more: What is the Current Price of a 4.8 mm Diamond?
Where to buy reputable and quality 16-carat diamonds?
With its immense value and exceptional rarity, purchasing a 16-carat diamond should be done through reputable brands. In Vietnam, Jemmia Diamond is the top choice for customers seeking this super rare diamond, let's find out why.
- 100% officially imported: Each stone comes with an invoice and GIA certificate.
- Only selects the top 2% of the world's most beautiful diamonds according to 4Cs standards.
- Equipped with international standard inspection equipment: GIA iD100, GIA Diamond Dock, GIA Match iD… allowing customers to verify directly.
- Ethical diamonds: transparent import, compliant with Kimberley Process.
- Transparent, public price list, easy to search and choose from.
- Optimal buy-back and exchange policies to ensure long-term value.
Buy quality diamonds at Jemmia
A 16-carat diamond is a perfect combination of rare beauty and sustainable investment value. With a weight of 3.2 grams, a size of nearly 17 mm, and a price ranging from hundreds of thousands to millions of USD, this is a luxury diamond segment for the ultra-rich and professional collectors.
