01
The formula
Finished carat weight ÷ rough carat weight × 100 = polished yield.
Example: 10.00 ct rough → 2.10 ct finished. 2.10 ÷ 10.00 × 100 = 21% polished yield.
02
Interpret yield in context
A low yield may be the correct result when the cutter removes unstable fractures or weak colour. A high yield may preserve weight at the expense of beauty or durability.
Every published yield should include the starting weight, finished weight, units, cutting path and enough imagery to understand the decision.