Answer: spinel

AnswerCrossword Clue
SPINELRubylike gemstone
SPINELThe Black Prince's Ruby is one
SPINELMineral used as a gem
SPINELRed gem.
SPINELKind of ruby.
SPINELOrnamental stone
SPINELRuby variety
SPINELRuby ... (gem)
SPINELCrystalline gemstone
SPINELRubylike gem
SPINELMineral containing magnesium
SPINELReddish mineral
spinela mineral, also SPINELLE
spinelmineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems
spinelany of a group of minerals composed principally of oxides of magnesium, aluminum, iron, manganese, chromium, etc., characterized by their hardness and octahedral crystals