Latest 2026 Update on 11-Carat Diamond Prices

An 11-carat natural diamond currently ranges in price from 5.9 billion to more than 35 billion VND (approximately 242,000 USD – 1.5 million USD). For stones with perfect color grade and clarity, or rare colored diamonds, the value can reach hundreds of billions of VND.

As part of the ultra-rare gemstone group, the price of an 11-carat diamond is calculated according to a progressive rule: the greater the weight, the higher the price per carat. To better understand the converted weight, actual millimeter size, and reputable places to buy, join Jemmia Diamond in exploring the details right below.

How much does an 11-carat diamond cost?

According to data from the Diamond Price Index® (updated 2025), the average price of natural diamonds from 5 carats and above is around 21,997 USD/carat. Therefore, an 11-carat natural diamond has an estimated price of:

11×21.997≈242.000USD (approximately 5,929,000,000 VND)

However, this figure is for reference only. In reality, the price of an 11-carat diamond can range from 250,000 USD to over 550,000 USD depending on the following factors:

• Color: from D (colorless) to Z (yellowish).
• Clarity: from Flawless to Included.
• Cut: Directly affects brilliance.
• International certification: GIA is the highest standard for verifying value.

For example, an 11.89ct Emerald Cut diamond, I/VS1, with GIA certification, was once listed at more than 551,000 USD on the international market.

It can be seen that an 11-carat natural diamond is not only a luxurious piece of jewelry but is also considered a rare investment asset, appearing only in high-end collections and major auctions.

How many ly and how many grams does an 11-carat diamond weigh?

According to the international standard of GIA (Gemological Institute of America), the weight and size of diamonds are converted as follows:

• 11 carats = 2.2 grams (1 carat = 0.2 gram).
• With the standard round cut (Round Brilliant), an 11-carat diamond has an approximate diameter of 14.9 ly (~14.9 mm).

Note: The actual size may vary depending on cut proportions, depth, and shape (Oval, Emerald, Pear…).

Thus, an 11-carat diamond stands out not only for its large weight of 2.2 grams but also for its size of about 14.9 mm - placing it in the rare gemstone group, often appearing in high-end jewelry collections and international auctions.

an 11-carat diamond has a diameter of about 14.9 ly

How much does an 11-carat diamond ring cost?

With a price of around 242,000 USD, when crafted into a ring, the actual price is often significantly higher because diamond jewelry prices depend on the following factors: 

• 4Cs quality
• Design style
• Ring material
• Crafting brand

On the international market, a ring set with an 11.89ct Emerald Cut diamond, I/VS1, GIA certified, was once listed at over 551,000 USD. For stones of higher quality (D color, VVS clarity), the price may exceed 1 million USD.

Therefore, an 11-carat diamond ring is not only jewelry that expresses class but also a long-term investment asset, usually appearing only in collections of the super-rich or in international auctions.

See more: Women's diamond rings luxurious, sophisticated, with discounts up to 18% at Jemmia Diamond 

An 11-carat diamond ring costs more than 242,000 USD

Where to buy a reputable and high-quality 11-carat diamond?

When deciding to invest in diamonds, customers are not only looking for a sparkling stone to honor their personal value but also need transparency, legal security, and sustainable value over time. This is exactly why Jemmia Diamond is trusted by many customers in Vietnam.

Why is Jemmia Diamond a reputable place to buy diamonds?

• 100% officially imported diamonds: All diamonds at Jemmia come with invoices and accompanying GIA documents, ensuring the stone is a legal asset for customers to own and invest in with peace of mind.
• Selection of the top 2% most beautiful diamonds in the world: Jemmia carefully selects diamonds according to GIA’s high 4Cs standards (color, clarity, cut, weight), completely eliminating stones with flaws that affect durability and structure. 
• Application of international-standard grading technology: Jemmia pioneers the use of GIA machines imported from the United States such as GIA iD100, GIA Diamond Dock, GIA Match iD… helping customers directly verify the quality and origin of each diamond.
• Ethical diamonds, transparent origin: All diamonds are imported from countries that comply with the Kimberley Process, ensuring they are not mined from war zones and do not harm people or the environment.
• Public, transparent price list: Customers can easily look up, compare, and choose diamonds that fit their budget without worrying about hidden costs.
• The best buyback - trade-in policy on the market: Jemmia is committed to supporting customers when they need to upgrade or resell. 

See more:  Distinguishing Moissanite and Diamond: 8 Main Differences

FAQ - Frequently asked questions about 11-carat diamonds

Is an 11-carat diamond the largest size yet?

An 11-carat diamond is not the largest size, however in the jewelry industry, it is already classified as an ultra-rare gemstone and extremely massive compared to regular commercial diamond lines.

Why is the price difference between color grades in 11-carat size so large?

The reason the price difference between color grades in 11-carat size is so large is that the broad surface area makes yellow tints (lower color grades) more visible, so perfect D-color stones are worth many times more than the remaining color grades.

Is a GIA certificate mandatory when buying an 11-carat diamond?

Buying an 11-carat diamond requires an international GIA grading report to ensure transparency in quality, natural origin, and preservation of the investment asset’s value for the owner.

An 11-carat diamond is a symbol of luxury and class, while also being a rare investment asset with long-term value. With its large weight, impressive size, and price tag of hundreds of thousands of USD, this is a segment only for customers who truly understand and wish to affirm their status.

To ensure you buy the right quality diamond, with transparency and international GIA certification, you should choose reputable, transparent brands that help secure your asset for the future. 

📞 Contact 0838 353 333 or Zalo Jemmia Diamond to receive expert consultation on 11-carat color-grade diamonds suitable for your needs and budget.