
1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone mineral 5) Gemstone 6) Jewel mineral 7) Jewel 8) Mineral gemstone 9) Mineral jewel 10) Polished jewel 11) Polished mineral 12) Precious gem 13) Prized stone 14) Prized mineral 15) Precious stone 16) Precious gemstone 17) Precious jewel
Found on
https://www.crosswordclues.com/clue/achroite

(from the article `tourmaline`) ...usually recognized: iron tourmaline (schorl), black in colour; magnesium tourmaline (dravite), brown; and alkali tourmaline, which may be pink ...
Found on
http://www.britannica.com/eb/a-z/a/12

A white potassium-rich variety of tourmaline.
Found on
https://www.encyclo.co.uk/local/20501

the colorless or white variety of tourmaline, often used as a gem.
Found on
https://www.infoplease.com/dictionary/achroite
No exact match found.