Strong’s Greek
G1307 — diaphanes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
διαυγής
diaphanes — pronounced dee-af-an-ace'
from 1223 and 5316; appearing through, i.e. "diaphanous":--transparent. see GREEK for 1223 see GREEK for 5316
1 occurrence in the KJV.
Revelation 21:21
And the twelve gates were twelve pearls: every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass.