Refers to transparent, colorless quartz, often used in jewelry, electronics, and spiritual contexts. In everyday Japanese, 水晶 usually means natural rock crystal rather than glass or synthetic crystal.
A small crystal is set in this ring.
水晶は石英の一種で、古くから装飾品に使われてきた。
Rock crystal is a type of quartz and has been used for ornaments since ancient times.
The water was as clear as crystal.
There are people who dig for crystal deep in the mountains.
The craftsman carefully polished the crystal.
This necklace is made out of crystal.
Strombus canarium turturella; dog conch subspecies
smoky quartz; cairngorm; morion