How Much is a 9 Carat Natural Diamond? Where to Buy Reputably?
Key Takeaways
- A 9-carat diamond is among the rarest and most valuable diamonds in the world. With a weight equivalent to 1.8 grams, a large size, and exceptional rarity, a 9-carat diamond is not...
A 9-carat diamond is among the rarest and most valuable diamonds in the world. With a weight equivalent to 1.8 grams, a large size, and exceptional rarity, a 9-carat diamond is not only sought after as a luxury piece of jewelry but also as a symbol of status and success. So, how much does a 9-carat diamond cost, what is its size in millimeters, and why is it so special? The following article will provide you with detailed insights.
What is a 9-carat diamond?
A 9-carat diamond is a gemstone weighing 1.8 grams (based on the conversion 1 carat = 0.2 grams). This is an extremely rare weight, far exceeding the common 1-3 carat diamonds often found on the market.
A 9-carat diamond is typically used in high-end jewelry designs or personal collections of the elite, due to its almost limitless value and rarity.

A 9-carat diamond weighs approximately 1.8 grams
How many millimeters is a 9-carat diamond?
In Vietnam, instead of using carats, many customers are accustomed to using the unit "ly" (which corresponds to millimeters) to visualize the size of the stone. So, what is the diameter of a 9-carat diamond in millimeters?
- For a standard round diamond, a weight of 9 carats corresponds to a diameter of approximately 13.2mm - 13.5mm.
- According to the conversion, 1 ly = 1 mm → a 9-carat diamond corresponds to about 13.2 ly to 13.5 ly.
- The variation depends on the cut: a shallower cut will have a larger diameter, while a deeper cut will be slightly smaller.
This indicates that the size of a 9-carat diamond is very large, significantly more prominent than 6 ly or 8 ly stones, and approaching "super rare" status on the market.

9 carat diamonds are approximately 13.2 ly to 13.5 ly
How much does a 9-carat diamond cost?
The price of a 9-carat diamond is not fixed, as it depends entirely on the international 4Cs standard. This explains why diamonds of the same 9-carat weight can have vastly different values.
The determining factors include:
- Carat (weight): 9 carats is an extremely rare weight, always belonging to the highest segment.
- Color (color): Color D (colorless) is the most expensive; descending to grades E, F, G, H..., the price decreases accordingly.
- Clarity (clarity): Higher transparency and fewer inclusions lead to a higher price.
- Cut (cut): An Excellent cut allows the diamond to reflect light maximally, significantly increasing its value.
Reference prices on the market:
- 9-carat diamond, Color D, Clarity IF, Cut Excellent → from 15 – 30 billion VND and above.
- 9-carat diamond, Color F – G, Clarity VVS or VS → around 10 – 18 billion VND.
- 9-carat diamond, Color H and below, Clarity SI → still valued at 7 – 10 billion VND due to its rare large weight.

The price of 9-carat diamonds is not specific, ranging from several billion to over 30 billion VND
See more: How much does a 6.3 ly diamond cost?
Why are 9-carat diamonds rare and highly valued?
Due to their massive size and natural rarity, 9-carat diamonds are considered among the "ultimate treasures" on the market. There are several reasons why this type of diamond always commands such a high and special value.
- Natural Rarity: Most diamonds mined are under 1 carat. Stones reaching 9 carats naturally are extremely rare.
- Difficulty in Crafting: The larger the diamond, the more challenging it is for artisans to maintain weight while achieving a perfect cut.
- Symbol of Status: 9-carat diamonds are often associated with extreme luxury, and only the super-rich or collectors can afford to own them.

9-carat diamonds hold great investment value
9-carat Diamond Jewelry
9-carat diamonds are typically crafted into special jewelry designs to highlight the rare size of the stone.
Some popular designs include:
- 9-carat Diamond Rings: often used for extravagant marriage proposals or as special anniversary rings.
- 9-carat Diamond Necklaces: featuring a prominent center stone, complemented by smaller diamonds to enhance the light effect.
- 9-carat Diamond Earrings: creating absolute elegance, typically worn at iconic events.

Elegant diamond jewelry designs from Jemmia
A 9-carat diamond is one of the rarest and most expensive gemstones on the market. With a size of approximately 13.2 – 13.5 millimeters and prices that can range from tens of billions of VND, this diamond holds not only material value but also serves as a testament to success and class.
When choosing a 9-carat diamond, buyers should pay attention to international grading reports (such as GIA) to ensure transparency and confirm the true value of the stone. This is a crucial factor in preserving the asset and long-term value of the diamond.