אַחְלָמָהʼachlâmâh

amethyst, one of the gems on the ephod (Exodus 28:19; Exodus 39:12)

Pronunciation: akh-law'-maw · Hebrew/Aramaic (Old Testament) · H306

Same root

חָלַםchâlam · H2492properly, to bind firmly, i.e. (by implication) to be (causatively to make) plump; also (through the figurative sense of dumbness) to dream

Where it appears

Appears 2 times in the Bible.

Exodus 28:19 The third row will contain an orange jacinth, an agate, and a purple amethyst.
Exodus 39:12 The third row contained an orange jacinth, an agate, and a purple amethyst.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).