Natural Yellow Sapphire Colorless to yellow to intense orange sapphire will react quite differently to lightor heat depending on the nature of the material and the origin of the color. Theauthors determined that there are ac more Blue Saphhire dont worry about the quality and purity of the gems. All gems are purely natural and tested. gems have ISI mark read more Emerald Emerald is a green variety of the mineral beryllium. It acquires its green color from minute amounts of chromium and vanadium in the mineral’s crystalline lattice structure. Emerald has a hardness ran more hessonite dont worry about the quality and purity of the gems. All gems are purely natural and tested. gems have ISI mark