chrysolite

Boyd’s Bible Dictionary:

(gold stone). Evidently the yellow topaz (Rev. 21:20).

Strong’s Dictionary of Greek Words:

Greek:
χρυσόλιθος
Transliteration:
chrusolithos
Phonic:
khroo-sol’-ee-thos
Meaning:
from 5557 and 3037; gold-stone, i.e. a yellow gem ("chrysolite")
KJV Usage:
chrysolite