Gems

Starting with C (left, above horizon) and moving clockwise: C-Trigonal-clear (diamond), Db-Monoclinic-reddish (kunzite), D-Tetragonal-orange (idocrase), Eb-Tetragonal-golden (scheelite), E-Hexagonal-yellow (golden beryl), F-Isometric-lime (fluorspar), F#-Hexagonal-green (Emerald), G-Orthorhombic-cyan (blue topaz), Ab-Monoclinic-blue (Lazulite), A-Orthorhombic-purple (Tanzanite), Bb-Trigonal-violet (amethyst), B-amorphous-irridescent (opal)