The unit of weight used for precious stones is the carat (1 carat = 200 mg, exactly). If a particular 1.25 carat diamond cost $7000.00, what is the cost of a collection of identical diamonds that weigh 1.00 ounce? [1 ounce = 28.35 grams]
A) $28,320
B) $35,8700
C) $16,750
D) $793,800

Question

Quizplus · Accepted Answer

1 ounce = 28.35 grams = 141.75 carats (since 1 carat = 200 mg)

Therefore, the price of one carat of diamond is $7000/1.25 = $5600.

And the price of 141.75 carats (i.e. 1 ounce) of diamond is 141.75 x $5600 = $793,800.

Hence, the correct answer is D.

The Unit of Weight Used for Precious Stones Is the Carat