Gem Used in an Engagement Ring in the West
Puzzle 19 of Working From Home Pack
Question is: Gem Used in an Engagement Ring in the West
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.