How much is a 20-carat diamond?

A 20 ly (20mm) diamond is a rare gemstone in a high-end segment with an estimated weight of 30 - 40 Carats, with prices ranging from 30 billion to over 200 billion VND per stone, depending on the 4C certification. With its large surface area, the stone is often considered a choice for personal collections or accumulated assets of international collectors. Let Jemmia Diamond learn more about the value and factors influencing this special gemstone segment below.

How much is a 20 ly diamond currently?

The price of a 20 ly natural diamond currently usually ranges from 30 billion to over 200 billion VND, largely depending on inspection indicators and market liquidity.

Due to its rarity, each 20 ly diamond is almost a unique individual, making it difficult to apply a fixed common price. Their value tends to increase cumulatively based on the following criteria:

• Clarity: With a large surface area like 20 ly, inclusions or scratches are more easily detected. Stones with clarity grades from VVS to IF have higher collection and investment value due to their natural rarity.
• Color: GIA grades color from D to Z. Among them, D color is the highest grade (colorless), providing brilliant whiteness. As you move down the alphabet, the yellow hue becomes more pronounced, leading to a significant decrease in the price of 20 ly diamonds compared to top-color stones.
• Cut: This is the factor that determines light reflection. A 20 ly diamond with a cut achieving Excellent symmetry and polish will optimize sparkle, thereby increasing the overall value of the product.

Note: Diamond prices in the article are updated on 01/04/2026. In case of scarce supply, diamond prices may increase sharply in the future.

See now: Latest Jemmia Diamond Price List or Contact Jemmia now:0838 353 333

The price of a 20 ly natural diamond currently ranges from 30 billion to over 200 billion VND

How many Carats is a 20 ly diamond equivalent to?

A 20 ly diamond (20mm diameter) weighs approximately 30.0 to 40.0 Carats for a Round Brilliant cut. The actual weight may vary depending on the depth of the pavilion and girdle of each specific stone.

According to standards from the Gemological Institute of America (GIA), this size belongs to the rare category in global mining output. Comparing the Carat parameters on the grading report is an important step to determine the commensurate value of the stone before transaction.

A 20 ly diamond (20mm diameter) weighs approximately 30.0 to 40.0 Carats

Where to buy a 20 ly diamond reputably?

JEMMIA DIAMOND is an expert authorized by the Gemological Institute of America (GIA) to import and distribute genuine GIA-certified diamonds in Vietnam.

• Transparent Legal Status: 100% of imported diamonds are official, with full VAT invoices and customs documentation.
• Selected Quality: Only provide 2% of the world's best quality diamond reserves, completely eliminating stones with structural flaws.
• Advanced GIA Technology: Pioneering the use of GIA iD100 and GIA Match iD systems to verify the origin and purity of each stone.
• Ethical Supply Chain: 100% of products comply with the Kimberley Process, with no origin from conflict zones.
• Superior Policy: Public, transparent price list accompanied by the best buy-back and exchange policy on the market.

A 20 ly diamond is a high-value gemstone with unique appeal in the world of luxury jewelry. Although the purchase price can reach hundreds of billions of VND, its rarity and aesthetic beauty continue to attract the attention of collectors. To receive consultation and accurate pricing information for the current time, you can contact us directly via hotline 0838 353 333.