How Many Grams Are in 1 Carat?
One metric carat (ct) equals exactly 0.2 grams.
This is the weight unit used for diamonds and other gemstones.
1 ct = 0.2 g
A 1-carat diamond weighs 200 milligrams.
1 g = 5 ct
Five carats of gemstones weigh one gram.
Carat vs. karat: Carat (ct) measures gemstone weight.
Karat (K), as in 18K gold, describes gold purity and cannot be
converted to grams without knowing the item’s weight.
One carat is equal to 0.2 grams. In other words, 5 carats equal 1 gram. A carat is a unit used to measure the weight of gemstones such as diamonds, emeralds, and rubies.
Carats to Grams Conversion Table
| Gemstone weight | Weight in grams |
|---|---|
| 0.25 ct | 0.05 g |
| 0.5 ct | 0.1 g |
| 1 ct | 0.2 g |
| 2 ct | 0.4 g |
| 5 ct | 1 g |
| 10 ct | 2 g |
How Do You Convert Carats to Grams?
Multiply the carat weight by 0.2.
For example, a 2.5-carat gemstone weighs
2.5 × 0.2 = 0.5 grams.
To convert grams to carats, multiply the weight in grams by
5.
Does 1 Carat Mean the Same Weight for Every Gemstone?
Yes. A 1-carat diamond, ruby, or emerald weighs the same:
0.2 grams. Their visible sizes can differ,
because gemstones have different densities and cuts.