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06:40 CH - Thứ Sáu | 21/05/2026

How Many Millimeters is a 1 Carat Diamond?

Key Takeaways

  • When choosing a diamond, many people wonder about the conversion between carats and millimeters, especially for 1-carat diamonds. So, how many millimeters is 1 carat? Let's learn with Jemmia Diamond about how...

When choosing a diamond, many people wonder about the conversion between carats and millimeters, especially for 1-carat diamonds. So, how many millimeters is 1 carat? Let's learn with Jemmia Diamond about how many millimeters 1 carat is, and the price of a 1-carat diamond ring in the following article!

How many millimeters is 1 carat?

For a standard Round Brilliant cut, a 1-carat diamond is approximately 6.3 mm – 6.6 mm. This weight is equivalent to exactly 0.2 grams. However, the actual millimeter size can vary depending on the shape and symmetry of the stone.

  • Diamonds weighing 0.2 carats are approximately 4.0 – 4.3 mm.
  • Diamonds weighing 0.3 carats are approximately 4.3 – 4.7 mm.
  • Diamonds weighing 0.4 carats are approximately 4.8 – 5.0 mm.
  • Diamonds weighing 0.5 carats are approximately 5.0 – 5.4 mm.
  • Diamonds weighing 0.6 carats are approximately 5.4 – 5.7 mm.
  • Diamonds weighing 0.7 carats are approximately 5.7 – 5.9 mm.
  • Diamonds weighing 0.8 carats are approximately 6.0 – 6.1 mm.
  • Diamonds weighing 0.9 carats are approximately 6.1 – 6.4 mm.
  • Diamonds weighing 1.0 carats are approximately 6.3 – 6.6 mm.

1 carat diamond is equal to 6.3 - 6.5 mm

A 1-carat diamond is equal to 6.3 - 6.6 mm

Why is a 1-carat 6.3mm round diamond a strategic asset for the elite?

In the investment diamond segment, 1 CARAT is a global market valuation benchmark. With a diameter of 6.3mm and ideal specifications of D/VVS1/3EX/None, the diamond becomes even rarer, belonging to the top

For this reason, 6.3mm - 1 carat transcends its role as jewelry and is classified as a strategic asset for the elite with the following roles:

Ultimate Mobile Asset

1 carat is equivalent to 0.2 grams, with a value of approximately $10,000 – high value density. Flexible for circulation.

Global Liquidity & Circulation

Possessing ideal specifications certified by GIA - the leading gemstone appraisal organization, a 6.3mm 1-carat diamond belongs to the group with the highest valuation, trading, and circulation potential in the international market.

Asset Value Security

Requiring no public disclosure of ownership, diamonds can be stored in international financial centers with high security standards. This is one of the core characteristics when considering safety and privacy factors in asset management.

Value Preservation Across Generations

Diamonds do not wear down or oxidize. At the 1-carat threshold with D/VVS1/3EX/None specifications, the diamond's value tends to accumulate long-term and is considered an inheritable asset.

Not only chosen for investment purposes, but 1-carat diamonds are also an ideal size for crafting high-end women's diamond rings, both enhancing elegance and preserving long-term asset value.

Why a 1-carat 6.3mm round diamond is a strategic asset for the elite

Why a 1-carat 6.3mm round diamond is a strategic asset for the elite

Jemmia Diamond – Reputable 1-Carat Diamond Destination

Jemmia Diamond is proud to be one of the leading reputable diamond brands in Vietnam, meeting all stringent international standards for quality, legality, and business ethics.

  • 100% Officially Imported 1-Carat Diamonds: All sales invoices and GIA certificates are provided. Each diamond is a legal asset, allowing customers to confidently own and invest long-term.
  • Selects Only the Top 2% of the World's Most Beautiful Diamonds: Undergoes strict inspection according to GIA's 4C standards for color, clarity, and cut. Committed to not using diamonds with flaws affecting durability and structure.
  • Pioneer in the Most Modern Machinery System from the USA: Jemmia uses 100% imported technology equipment from GIA USA, including GIA iD100, GIA Diamond Dock, GIA Match iD… to verify the quality and origin of each diamond.
  • Ethically Sourced Diamonds: Only imports from countries complying with the "Kimberley Process," ensuring diamonds are not mined from conflict zones and do not cause harm to people and the environment.

Diamonds at Jemmia always have clear origins, ensuring quality, global reputation, and worldwide value. With a sales and warranty policy that guarantees customer rights when purchasing 1-carat diamonds. Visit JEMMIA DIAMOND now to choose your perfect diamond with guaranteed quality!

FAQ - Frequently Asked Questions

How much does a 1-carat diamond ring cost?

A 1-carat diamond ring typically ranges from 70,000,000 VNĐ to 500,000,000 VNĐ depending on other factors. A ring with an exquisite design, crafted from 18K gold or platinum, can cost from millions to tens of millions of Vietnamese dong. The price of a 1-carat diamond ring varies significantly depending on the GIA USA 4Cs standards, based on 4 criteria: cut, color, size, and clarity. In addition, the value of a diamond ring also depends on the design style and the ring's material.

What is 0.5 carat in millimeters?

When converted to millimeters, a 0.5-carat diamond is equivalent to 5.0 mm – 5.4 mm. Furthermore, the size of a 0.5-carat diamond can vary depending on its shape or cut. The price of a 0.5-carat diamond fluctuates depending on factors such as cut, color, clarity, and weight. Specifically, a 0.5-carat diamond costs approximately 12,955,250 VNĐ – 90,568,975 VNĐ.

How much does a 10-carat diamond cost?

A 10-carat diamond costs approximately 4,160,000,000 VNĐ – 55,828,000,000 VNĐ, weighing about 2.0 grams. This is an impressively sized diamond with a diameter of 10 mm, possessing captivating and luxurious beauty. A 10-carat diamond signifies class when paired with jewelry, attracting all attention.

This article has answered your question about how many millimeters is 1 carat. Jemmia Diamond hopes this helps you better understand this special unit of measurement for diamonds. If you have any further questions about natural diamonds, please contact a Jemmia diamond expert for direct consultation!

Discover the latest diamond jewelry collections from Jemmia's diamond experts – where your exquisite beauty and unique style are celebrated:

💎Diamond Jewelryhttps://jemmia.vn/collections/trang-suc-kim-cuong
💎Diamond Ringshttps://jemmia.vn/collections/nhan-kim-cuong
💎Diamond Earringshttps://jemmia.vn/collections/bong-tai-kim-cuong
💎Diamond Pendantshttps://jemmia.vn/collections/mat-day-chuyen-kim-cuong
💎Diamond Braceletshttps://jemmia.vn/collections/lac-vong-tay-kim-cuong
💎Diamond Wedding Ringshttps://jemmia.vn/collections/nhan-cuoi-kim-cuong
Nhung Hoang

Author: Nhung Hoang

Content Writer Specialist

Nhung Hoang là Content Writer Specialist với hơn 3 năm kinh nghiệm nghiên cứu và phát triển nội dung về kim cương tự nhiên và ngành trang sức. Với nền tảng kiến thức được đào tạo trực tiếp bởi Giám đốc hoạch định GIA của Jemmia Diamond, Nhung Hoang tập trung xây dựng các bài viết chuyên sâu về kim cương GIA, trang sức kim cương và xu hướng trang sức, nhằm mang đến những thông tin chính xác và đáng tin cậy cho người đọc.

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