What is the value of one carat when expressed in SI units?

Correct option is D

The correct answer is (d) 200 milligrams
Explanation:
· One carat is equal to 200 milligrams, which is the standard SI measurement used for weighing gemstones.
· The metric carat was internationally adopted in 1907 to standardise gem measurements.
· This unit is commonly used for diamonds and other precious stones.
Information Booster:
· Gem quality is assessed using the four Cs: carat, cut, clarity and colour.
· Carat refers to weight, not size; two stones of equal carat may differ in dimensions.
Additional Knowledge:
· 500 mg (a) and 100 mg (c) do not correspond to any recognised gem measurement unit.
· 1 gram (b) equals 5 carats, not 1 carat.