Carats to Grams

Convert carats to grams instantly. Free online carat to gram converter for gemstones, jewelry, and precious stones.

The Carats to Grams converter is essential for anyone working with gemstones and precious materials. The carat is the standard unit for measuring diamonds and other gemstones, while grams provide a more universally understood weight reference. This tool helps jewelers, gemologists, and consumers convert carat weights to grams for comparison, valuation, and documentation purposes with complete accuracy.

Converter

0.2

Formula: g = carat × 0.2

Common use cases

  • Jewelry appraisal and documentation
  • Gemstone buying and selling
  • Insurance valuations
  • Scientific and gemological research
  • Comparing gemstone weights across systems

How to use

  1. Enter the carat weight
  2. View the gram equivalent instantly
  3. Use decimals for precise carat values
  4. Copy results for documentation
  5. Clear for new conversions

FAQ

How many grams are in one carat?

One metric carat equals exactly 0.2 grams (200 milligrams).

Why is the carat used for gemstones?

The carat provides a precise, standardized measurement for small precious stones, where even small weight differences significantly affect value.

Is this the same carat used for gold?

No, 'karat' for gold measures purity (24 karat = pure gold), while 'carat' for gemstones measures weight.

When was the carat standardized?

The metric carat of 200 mg was adopted internationally in 1907, providing a universal standard for the gem trade.