About the Units
grain (gr)
A unit of mass equal to 64.79891 milligrams, originally based on the weight of a grain of barley.
carat (ct)
A unit of mass equal to 200 milligrams, used for measuring gemstones and pearls.
Common Conversions
- 1 gr = 0.32399455 ct
- 3.0864718 gr = 1 ct