How Much Does 1 Gram, 1 Kilogram of Diamond Cost?
Key Takeaways
- 1kg of natural diamonds (equivalent to 5,000 carats) has an estimated value ranging from trillions of VND to an unpriceable level. Because diamonds are priced individually based on the 4Cs standard (Color,...
1kg of natural diamonds (equivalent to 5,000 carats) has an estimated value ranging from trillions of VND to an unpriceable level. Because diamonds are priced individually based on the 4Cs standard (Color, Clarity, Cut, Carat Weight), a 1kg batch of diamonds made up of many small stones will be worth much less than a single diamond weighing 1kg (which would be a historical treasure).
Join Jemmia to find out why 1kg of diamonds costs how much, and how much 1 gram of diamonds costs in the article below.
How much does 1kg of diamonds cost?
In the jewelry industry, diamonds are priced in carats (ct) instead of grams or kilograms. Below is the international standard conversion:
- 1 carat = 0.2 grams
- 1 gram = 5 carats
- 1kg = 5,000 carats
According to the Rapaport price list for 03/2026, the average value of high-quality diamonds varies greatly. If we take the reference price for investment-grade diamonds (1.00ct, D color, VVS1) at around 350 million VND, then 1kg of diamonds would have a theoretical value of about 1.75 trillion VND. However, if this 1kg includes large stones (over 5 carats), the figure would exceed 6 trillion VND.
1kg of diamonds can be worth up to trillions of VND
Why is it difficult to value 1kg of diamonds?
The value of diamonds is not calculated by cumulative weight like gold.
Pricing depends on the individual quality of each stone in that 1kg batch. Below are the 3 deciding factors:
- The 4Cs standard is not uniform: 1kg of D-color diamonds (colorless) is worth many times more than 1kg of K-color diamonds (yellowish). Similarly, IF clarity will drive the price dozens of times higher than I1-I3 grades.
- Progressive weight effect: A 5-carat diamond is many times more expensive than the combined value of five 1-carat diamonds. Therefore, 1kg of diamonds made up of large stones will have an astronomical price.
- Physical rarity: Only 20% of mined diamonds are gem quality. To collect enough clean diamonds to make 1kg, operators must screen millions of tons of gemstone ore.
How much does 1 gram of diamonds cost?
To make it easier to visualize, we can narrow the question down to how much 1 gram of diamonds costs.
According to the conversion, 1 gram of diamonds is equivalent to 5 carats. The value of 5 carats of diamonds depends on the quality of each stone.
- For high-quality diamonds (D color, IF clarity, Excellent cut), the price can range from 7 to 15 billion VND or higher.
- For those with a yellowish color and many inclusions, the price will be significantly lower.
| Specifications (5.00 ct stone) | Color/Clarity | Estimated price (VND) | Characteristics |
| Investment diamond | D Color / IF | 12 billion - 18 billion | Extremely rare, holds value well |
| Jewelry diamond | F Color / VVS1 | 7 billion - 10 billion | Perfect whiteness for rings |
| Lab-grown diamond | D Color / VVS1 | 250 million - 450 million | Low value, no investment potential |
The price of 1 gram can range from 7 to 15 billion VND or higher
See more: Choose a diamond ring based on your finger
Why are diamonds so expensive?
Diamonds are expensive mainly because of the enormous mining costs and the rarity of gem-quality stones. In fact, only 20% of mined diamonds meet jewelry standards, while the rest are used only in industry.
- Harsh screening ratio: To obtain 1 carat (0.2g) of gem-quality diamond, miners must process an average of 250 tons of earth and rock at depths of thousands of meters.
- Asset-backed value: Thanks to their eternal hardness and high value concentration (a small stone worth billions of VND), diamonds have long been used as stored assets and bank deposits in South Africa.
- Supply control: Major syndicates regulate the amount of rough diamonds released to the market to maintain scarcity and ensure value does not decline.
- Certification and legal costs: The strict certification process from GIA and compliance with ethical sourcing (Kimberley Process) also contribute to the final price of the stone.
Diamonds are expensive mainly because of the enormous mining costs and the rarity of gem-quality stones
FAQ - Frequently asked questions about diamond weight
How many kg does the largest diamond in the world weigh?
The Cullinan diamond is the largest ever discovered, weighing 3,106 carats (about 0.62kg). It is considered priceless and is currently set in the Crown Jewels and sceptre of the British Royal Family.
How big is 1kg of diamonds?
With a density of 3.51 g/cm³, 1kg of diamonds has a volume of about 285 cm³. It is only about the size of two adult hands cupped together.
What diamond size should you buy to retain value best?
Sizes from 1 carat to 3 carats are the most liquid segment in Vietnam. Stones weighing 1 gram (5 carats) or more require a more complicated trade-in and certification process.
We hope that the information we shared in this article has given you enough basis to answer how much 1 gram and 1kg of diamonds cost. Visit Jemmia Diamond regularly to update yourself with more in-depth information about diamonds as well as today’s luxurious diamond jewelry.
