Gemstone and diamond carat converter.
Convert gemstone carats to grams, milligrams, points and ratti with the selected ratti convention.
Gemstone and diamond carat converter inputs
A metric carat is 200 mg and one carat has 100 points. Ratti is a selected trading convention; mass alone does not determine gemstone quality or value.
Method: One metric carat is exactly 200 milligrams. Points divide a carat into 100 equal parts; ratti remains a selectable market convention.
Inputs used: Gemstone weight = 1 ct
Assumptions: The result uses the values, units and options shown in the input snapshot.
Scope and warnings: A metric carat is 200 mg and one carat has 100 points. Ratti is a selected trading convention; mass alone does not determine gemstone quality or value. Rounding and excluded real-world terms can make an external result differ.
How this gemstone and diamond carat converter works
One metric carat is exactly 200 milligrams. Points divide a carat into 100 equal parts; ratti remains a selectable market convention.
A worked example
A one-carat stone has a mass of 0.2 g, 200 mg and 100 points before any quality assessment.
Does carat weight determine gemstone value?
No. Cut, colour, clarity, treatment, origin, certification and market demand affect value beyond mass.
Calculations run on your device. Review your results before exporting or sharing them.
Carat is mass, not a quality grade
A metric carat is exactly 200 milligrams and divides into 100 points. The calculator changes mass units only; it does not grade a stone.
Ratti is a selected convention. Certification, cut, colour, clarity, treatment and origin matter far more than a conversion when assessing value.
Published by ToolMitra — methods and editorial approach.