Gemstone; One of December's Modern Birthstones

This page is the CodyCross answer for the clue below from Science Lab, Group 312, Puzzle 1 (Decomposition).

Question is: Gemstone; One of December's Modern Birthstones

and the answer is: ZIRCON

Word Meaning:

ZIRCON — (uncountable) A mineral occurring in tetragonal crystals, usually of a brown or grey colour and consisting of silica and zirconia.

Definitions from Wiktionary.

Gemstone; one of December's modern birthstones — CodyCross Answer | CodyCross Solutions