Chalcedony (noun)

A mineral, a variety of quartz, that is a compact, massive form of microcrystalline quartz, typically white or bluish-grey, and often used as a gemstone or ornamental stone.

Origin:

From latin chalcedonius, from ancient greek χαλκηδών (khalkēdōn, "chalcedon"), a city in asia minor.

Examples:

1. The chalcedony necklace was a gift from my mother.
2. The artist used chalcedony to create intricate designs on the vase.
3. Chalcedony is one of the most prized gemstones for its beauty and durability.
4. This variety of chalcedony is known for its bluish-grey color.
5. Chalcedony has been used for ornamental and practical purposes for centuries.