All precious metals are weighed in troy ounces (or grams).

Below are conversion factors that will help in navigating this, perhaps, unfamiliar system.  I am indebted to Wikipedia for the majority of this information!

The old joke used to be "Which is heavier, a pound of rocks or a pound of feathers?"  Of course, they both weigh the same, in the avoirdupois system (bathroom scale) as 1 pound = 1 pound.

A troy pound is LIGHTER than an avoirdupois pound, BUT a troy ounce is HEAVIER than an avoirdupois ounce.  Go figure. Literally.

There are 12 troy ounces to a troy pound, 14 7/12 troy ounces in an avoirdupois pound.

GOLD CONTENT

Percentage of gold in various karat weights:

10 karat = .417 or 41.7% gold (10/24)

14 karat = .585 or 58.5% gold (14/24)

16 karat = .666 or 66.6% gold (16/24)

18 karat = .75 or 75% gold (18/24)

22 karat = .92 or 92% gold (22/24)

24 karat = 10.0 or 100% gold (24/24)