What karat rating means pure gold?
Answer24 karat
24 karat is 24 parts out of 24, or pure gold.
Science · Facts & stats
Au facts & stats
7 fact-checked facts about gold, the chemical element Au, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Why doesn't gold rust or tarnish?
AnswerIt is highly unreactive
Gold resists oxidation, so it keeps its shine.
Going deeper
Gold found at Sutter's Mill sparked the California Gold Rush in which year?
Answer1848
James Marshall found gold there in January 1848.
Precious metals like gold are traditionally weighed in which unit?
AnswerTroy ounce
Gold prices are quoted per troy ounce.
Olympic gold medals are made mostly of which metal?
AnswerSilver
Modern gold medals are silver plated with gold.
Expert level
About how many grams are in one troy ounce?
Answer31.1
A troy ounce is about 31.1 g, heavier than a regular ounce.
Which was the last Olympics to award solid gold medals?
Answer1912 Stockholm
Solid gold medals were last given at the 1912 Games.
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