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precious stone:see gemgem,
commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see month.
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precious stone[′presh·əs ′stōn]
Any genuine gemstone.
A gemstone of high commercial value because of its beauty, rarity, durability, and hardness; examples are diamond, ruby, sapphire, and emerald.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
any of certain rare minerals, such as diamond, ruby, sapphire, emerald, or opal, that are highly valued as gemstones
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005