Enter a clue or pattern or both:
The Clue
Matura diamond, actually (6 letter answer)
The Answer
ZIRCON
Tags
Notes
The answer ZIRCON is rarely seen, appearing only about once every 2100 puzzles.
Related Clues
Gem
December birthstone
December stone
Diamond substitute
Matura diamond
Modern December birthstone
Definition
ZIRCON as a noun:
1. (zircon, zirconium silicate) = a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent