Gemstones, sapphire, ruby, emerald, tourmaline, apatite, aquamarines, alexandrite, garnet, tsavorite, demantoid, sphene, spessartite, topaz, labradorite, amethyst, spinel, opal, citrine, jadeite, quartz.
Precious stones like imperial topaz.
Gemstones.
Gemstones.