How Much is a 12 Carat Natural Diamond? Where to Buy Reputably?
Key Takeaways
- A natural 12-carat diamond currently costs between 6.5 billion and over 40 billion VND (approximately 264,000 USD – 1.6 million USD). Diamonds with perfect D color or rare colored diamonds can reach...
A natural 12-carat diamond currently costs between 6.5 billion and over 40 billion VND (approximately 264,000 USD – 1.6 million USD). Diamonds with perfect D color or rare colored diamonds can reach hundreds of billions of VND.
Due to being super rare gemstones, the price of 12-carat diamonds increases progressively: the larger the weight, the higher the price per carat. To understand the weight conversion (2.4 grams), actual millimeter size, and reputable purchasing addresses, please join Jemmia Diamond to learn more in the article below.
How Much Does a 12 Carat Diamond Cost?
A natural 12-carat diamond is estimated to cost 6,547,200,000 VND. A 12-carat diamond with a size of over 15 millimeters and a weight of 2.4 grams is one of the highest-value products in the jewelry market.
According to data from Diamond Price Index® (2025), the average price of natural diamonds from 5 carats upwards ranges around 21,997 USD/carat.
12×21,997≈264,000 USD (6,547,200,000 VNĐ)
However, this is just a reference. In reality, the price of a 12-carat diamond can fluctuate more, depending on:
- Color
- Clarity
- Cut
- International certification
- Fluorescence and other affecting inclusions
For example, many diamonds sized 12 carats or larger have been listed at over 1 million USD on the international market when achieving perfect color (D color) and high clarity (VVS).
It can be seen that natural 12-carat diamonds not only possess brilliant beauty but are also exquisite jewelry for the elite, featured in the world's most prestigious collections and auctions.
Estimated price of a 12-carat diamond: 6,547,200,000 VND
How Much Does a 12 Carat Diamond Ring Cost?
If a 12-carat diamond already has significant value, then when crafted into a ring, the actual price will be considerably higher due to multiple combined factors.
Factors affecting the price of a 12-carat diamond ring:
- Quality according to GIA's 4Cs standard.
- Design style
- Crafting material: 18K gold, 14K gold, and surrounding accent diamonds
- Crafting brand
On the international market, a ring with a diamond of 12 carats or more usually costs from 400,000 USD to over 1.2 million USD. For diamonds meeting high 4Cs standards, the price can far exceed the 1.5 million USD mark.
Reference: Elegant and sophisticated ladies' diamond rings at Jemmia Diamond
Rings with diamonds of 12 carats or more usually cost from 400,000 USD to over 1.2 million USD
Where to Buy Reputable and Quality Diamonds?
Given their high value, choosing a reputable diamond purchasing address is extremely important. Jemmia Diamond is one of the leading reputable diamond brands in Vietnam, trusted by many customers for its transparency and strict international standards.
Why choose Jemmia Diamond?
- 100% Officially Imported via Customs: Every diamond comes with an invoice and GIA certificate, ensuring its legal status as an asset.
- Only Select the Top 2% of the World's Most Beautiful Diamonds: Rigorously selected, meeting GIA's high 4Cs standards, free from flaws affecting durability and structure.
- Pioneer in Equipping the Most Modern GIA Inspection Equipment: Equipped with GIA systems imported from the US, such as GIA iD100, GIA Diamond Dock, GIA Match iD…, allowing customers to directly verify quality.
- Transparent Diamond Origin: Only imported from countries adhering to the Kimberley Process, not mined from conflict zones, with transparent origin.
- Public and Transparent Diamond Prices: Helping customers easily compare and choose within their budget.
- Competitive Buy-Back - Exchange Policy in the Market: Ensuring enduring value and high liquidity for the diamond.
Jemmia Diamond diamonds ensure transparency and reputation in origin and selling price
A 12-carat diamond is an absolute testament to luxury and power, as well as a rare long-term investment asset. With a weight of 2.4 grams, a diameter of over 15 millimeters, and prices ranging from hundreds of thousands to millions of USD, this segment is exclusively for the elite and collectors.
To ensure you acquire a quality, transparent 12-carat diamond with international certification, choose a reputable brand in the market.
Contact us immediately at 0838 353 333 or Zalo Jemmia Diamond to receive detailed consultation from our experts and a quote for a 12-carat diamond that suits your needs.
What Size (in Millimeters) Is a 12 Carat Diamond?
For the popular Round Brilliant cut, a 12-carat diamond will have a diameter of approximately 14-15 millimeters.
For other cuts, a 12-carat diamond will have the following dimensions:
- Emerald Cut: 14x12 – 16x12 mm
- Asscher Cut: approximately 12 – 13 mm
- Oval Cut: approximately 16x14 – 18x13 mm
- Radiant Cut: approximately 15x11 – 14x12 mm
- Heart Cut: approximately 15-16 mm
- Cushion Cut: approximately 12-13 mm
See also: 6 Hottest Diamond Ring Settings of the Year
How Many Grams Does a 12 Carat Diamond Weigh?
According to international standards from GIA (Gemological Institute of America):
For a standard Round Brilliant cut, a 12-carat diamond has a diameter of approximately 15.3 millimeters (~15.3 mm).
Note: Actual dimensions may vary depending on the cutting proportions, depth, and shape of the cut (Oval, Emerald, Pear…).
Thanks to its large weight and diameter of over 15 millimeters, a 12-carat diamond is classified as a super rare gemstone, usually found only in luxury jewelry collections or at international auctions.
