Multicolour.com > Gem Library > Gemstones Varieties
Gem quality sphalerite is a rare collector stone. The mineral is usually nearly black in color but is occaisionally found in transparent pieces of an orange or yellowish brown hue. Clean pieces are extremely rare. More @ www.multicolour.com and #gemstones
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Sapphire
Padparadscha sapphire is a pink-orange corundum, with a low to medium saturation and light tone, originally being mined in Sri Lanka, but also found in deposits in Vietnam and Africa; Padparadscha sapphires are rare. The name derives from the Sinhalese word for lotus blossom. The rarest of all padparadschas is the totally natural variety, with no sign of treatment.