Which gem is the hardest natural mineral?
AnswerDiamond
Diamond scores 10 on the Mohs hardness scale.
Fashion · Facts & stats
Bling facts & stats
7 fact-checked facts about jewelry, gemstones and sparkle, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Which gem forms inside oysters and other mollusks?
AnswerPearl
Pearls grow in layers of nacre around an irritant.
Going deeper
Emerald is a green variety of which mineral?
AnswerBeryl
Aquamarine is another variety of beryl.
Rubies and sapphires are both forms of which mineral?
AnswerCorundum
Red corundum is ruby; other colors are sapphire.
Which purple gemstone is a variety of quartz?
AnswerAmethyst
Amethyst gets its color from iron and natural radiation.
Expert level
One carat, the unit for weighing gems, equals how much?
Answer200 milligrams
Five carats make one gram.
Sterling silver is what percentage silver by weight?
Answer92.5 percent
The rest is usually copper, which adds strength.
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