Diamond Weight Converter
Convert between carats, points, grams, and milligrams for diamonds and gemstones.
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Diamond and gemstone weight uses the carat system.
Base relationships:
- 1 carat = 200 milligrams = 0.2 grams (exact, by international definition)
- 1 carat = 100 points
- 1 point = 2 milligrams = 0.002 grams
Other conversions:
- 1 carat = 0.00705 troy ounces
- 1 carat = 3.086 grains
- 5 carats = 1 gram (exact)
Common diamond sizes and weights:
| Carats | Points | Grams | Milligrams |
|---|---|---|---|
| 0.25 ct | 25 pts | 0.05 g | 50 mg |
| 0.50 ct | 50 pts | 0.10 g | 100 mg |
| 0.75 ct | 75 pts | 0.15 g | 150 mg |
| 1.00 ct | 100 pts | 0.20 g | 200 mg |
| 1.50 ct | 150 pts | 0.30 g | 300 mg |
| 2.00 ct | 200 pts | 0.40 g | 400 mg |
| 5.00 ct | 500 pts | 1.00 g | 1000 mg |
Note: The gemstone carat (weight) is different from the gold karat (purity).