Strong's #3095: yahalom (pronounced yah-hal-ome')

from 1986 (in the sense of hardness); a precious stone, probably onyx:--diamond.

Brown-Driver-Briggs Hebrew Lexicon:

yahălôm

1) a precious stone (known for its hardness)

1a) perhaps the jasper, onyx, or diamond

Part of Speech:

Relation: from H1986 (in the sense of hardness)

Usage:

This word is used 3 times:

 

Exodus 28:18: "row shall be an emerald, a sapphire, and a diamond."
Exodus 39:11: "row, an emerald, a sapphire, and a diamond."
Ezekiel 28:13: "was thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the jasper, the sapphire,"