Guides
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3 min read
Grams, karats and troy ounces: a 3 minute explainer
Gold has its own units and purity marks. This short guide explains what you are actually buying when you hold a gram.
Hana Prasetyo, Head of Research
Gold is weighed in troy ounces, quoted in grams, and graded by purity. It is easy to mix them up, so here is the short version.
Weight
One troy ounce equals 31.1 grams. Market prices are usually quoted per troy ounce, while Aurelo shows you the price per gram so small amounts are easier to read.
Purity
Every gram you hold is 999.9 fine, which means 99.99 percent pure gold. Jewelry is often 18 or 22 karat, which contains other metals and is priced differently.