Price: US $0.00
Sapphire (which probably referred instead at the time to lapis lazuli) is a gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3). Trace amounts of other elements such as iron,titanium, chromium, copper, or magnesium can give corundum blue, yellow, pink, purple, orange, or a greenish color. Chromium impurities in corundum yield a red tint, and the resultant gemstone is called a ruby.
Color Zoning is an unevenness of color. Color Zoning is the key inclusion to deifferentiate natural gemstones from synthetice gemstone as it can be found only in natural gemstones espeically in natural Blue Sapphire. It's a gift of nature!