Enter a clue or pattern or both:
The Clue
Cubic ___ (gem) (8 letter answer)
The Answer
ZIRCONIA
Tags
Notes
The answer ZIRCONIA is so rare that it appears less than once every 2500 puzzles.
Definition
ZIRCONIA as a noun:
1. (zirconium oxide, zirconia, zirconium dioxide) = a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes