Wiktionary
n. Any gem, such as a diamond or ruby, that is expensive because of its rarity or desirability; especially one set into a piece of jewelry.
WordNet
Usage examples of "precious stone".
As a child he had stood before the marble cutters, hungering to get his hands on this precious stone.
Deer Ears came very close to the inscription above the sacristies, and two of the lines were exact: 'In darkness languishes the precious stone.
Thorns, sharpened twigs, thin blades whittled from bone, pins carved from precious stone, all those had been thrust through the soft folds of skin to serve as a gruesome adornment.
In his wildest dreams he had never visualized so many soaring edifices, jeweled inlays, and polished slabs of precious stone.
Those who did not wear jewelry of gold or silver or precious stone were still bedecked with ornaments of shell, feather, and seeds.
Oh, I can make some of it into trinkets, I suppose, but it is no precious stone like turquoise or emerald.
The log walls of the barn and its snow-covered roof, that looked as if hewn out of some precious stone, sparkled in the moonlight.
Topaz: Sometimes called the jewel of light because it prolongs faerie fire spells cast upon it so that they last 6d4 days, the topaz is a very hard, durable, golden, translucent precious stone found in large crystals in granite.
He turned it over and back and forth in his mind, the way a jeweller examines a precious stone for impurities.
Lozan Duk told them, changing the subject as he stowed away his precious stone.