GEOLOGY

Detailed explanation-1: -Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip. (Don’t confuse carat with karat, as in “18K gold, ” which refers to gold purity.) Just as a dollar is divided into 100 pennies, a carat is divided into 100 points.

Detailed explanation-2: -The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz) or 0.00643 troy oz, and is used for measuring gemstones and pearls.

Detailed explanation-3: -A carat is a unit of weight measurement for gemstones of all types. Each carat is approximately two hundred milligrams (0.2 grams) or one fifth of a gram. The definition of Carat is only correct when referring to gemstones and should not be confused with the meaning of karat when referring to gold.

Detailed explanation-4: -If 1 carat = 3.168 grains (a unit of mass) and 1 gram = 15.4 grains, find the total mass in kilogram of the ring that contains 0.5 carat diamond and 7 grant gold.