Definitions for "Solid Gold"
Keywords:  finer, karat, gold, espoo, retitled
Fine old or gold of 24 karat. The term "solid gold" should not be applied to articles of lesser quality. Sterling Silver: Must be 925/1000 (92.5%) fine silver and 75/1000 (7.5%) copper. This proportion is fixed by law. Troy Ounce: From the troy system of weight used for measuring precious metals, based on a pound of 12 ounces and an ounce of 20 pennyweights or 480 grains. Precious metals are measured in troy ounces worldwide.
A term that some would reserve for fine or 24k gold because it contains no other metals (alloys); however, in 1967 the Federal Trade Commission held that solid gold may be used to describe articles that do not have a hollow center and are 10k or finer.
"Solid gold" refers to any karat gold if the inside of the item is not hollow.