Carats to Grams Converter
Convert carats to grams and grams to carats. Jewelry-friendly ct to g calculator with exact formula.
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Carats to Grams Converter
Carats (ct)
→
Grams (g)
Common Carats to Grams Examples
0.25 ct = 0.05 g
0.25 ct to g
0.5 ct = 0.1 g
0.5 ct to g
0.75 ct = 0.15 g
0.75 ct to g
1 ct = 0.2 g
1 carat to grams
2 ct = 0.4 g
2 carat to grams
5 ct = 1 g
5 carat to grams
Carats to Grams: Definition, Origin, Current Use, and Examples
Definition
A carat (ct) is the standard mass for gemstones. One carat equals exactly 0.2 grams (200 milligrams).
Grams (g) = Carats (ct) × 0.2
Origin or History
The term comes from the carob seed once used on balance scales. The modern metric carat was fixed at 0.2 g to standardize diamond and gemstone trade.
Current Use
- Diamond weight: 0.5 ct to grams, 1 ct to grams for ring listings
- Gemstone parcels: converting parcel carats to grams for inventory
- Appraisal & shipping: ct to g for documentation
Examples
| Carats (ct) | Grams (g) | Context |
|---|---|---|
| 0.25 ct | 0.05 g | Quarter-carat diamond |
| 0.5 ct | 0.1 g | Half-carat solitaire |
| 0.75 ct | 0.15 g | Three-quarter carat |
| 1 ct | 0.2 g | One-carat benchmark |
| 2 ct | 0.4 g | Large gemstone |
Frequently Asked Questions
How many grams is 1 carat diamond?
1 ct = 0.2 g (200 mg). Example: 1.5 ct = 0.3 g.
What is 0.5 carat in grams?
0.5 ct × 0.2 = 0.1 g.
How do I convert carats to grams?
Use grams = carats × 0.2. Example: 0.75 ct × 0.2 = 0.15 g.
Are carat (ct) and karat (K) the same?
No. Carat measures gemstone mass; karat measures gold purity (e.g., 18K).