Traditional Stone for an Engagement Ring
This page is the CodyCross answer for the clue below from Concert Hall, Group 587, Puzzle 2 (Metropolitan Opera).
Question is: Traditional Stone for an Engagement Ring
and the answer is: DIAMOND
Word Meaning:
DIAMOND — (uncountable) A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron.
Definitions from Wiktionary.