a yellow quartz
"The ancient gem was carved from clear topaz, which in that region referred to a pure yellow quartz stone."
a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
"The jeweler selected a brilliant blue topaz to set in the ring because its vibrant color matched the wearer's eyes perfectly."
A silicate mineral of aluminium and fluorine, usually tinted by impurities.
"The geologist carefully examined the rough topaz crystal to identify its aluminum-silicate composition before noting how trace iron ions had given it a pale yellow hue."
In plain English: Topaz is a hard, naturally occurring gemstone that often comes in shades of yellow, orange, blue, or clear glass-like color.
"She wore a delicate necklace with a bright yellow topaz pendant."
Usage: The adjective form "topaz" is often misused to describe any brownish-yellow hue; it specifically refers only to shades resembling the gemstone itself. Avoid using it as a verb or in contexts unrelated to mineralogy and color comparison.
Of a yellowish-brown color, like that of the gemstone.
"The autumn leaves turned to a rich topaz hue as the sun began to set."
"The topaz ring sparkled brilliantly under the sunlight."
A female given name
"My aunt named her daughter Topaz after the precious gemstone."
The word entered English via the Old French topace, which borrowed it directly from the Ancient Greek tópasos. Originally used in ancient Greece, the term has retained its reference to the yellow gemstone throughout its journey into modern English.