Strong’s Greek
G262 — amarantinos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀμαράντινος
amarantinos — pronounced am-ar-an'-tee-nos
from 263; "amaranthine", i.e. (by implication) fadeless:--that fadeth not away. see GREEK for 263
1 occurrence in the KJV.
1 Peter 5:4
And when the chief Shepherd shall appear, ye shall receive a crown of glory that fadeth not away.