Karat: karat # denotes % of gold to alloy material. 14 karat is 14 parts gold in 24 total parts. Balance is alloy material which gives gold its particular color.
Sterling silver: an alloy of 92.5% fine silver, 7.5% copper
Karat gold: choose from 14 or 18 karat in yellow, green, or rose colors
Gold fill: by marrying a layer of karat gold to a non-precious back we have a layer of solid karat gold to work with. The 1/10 14 karat gold is 10% gold by thickness.