19 gemstones, rubies, blush spinels, and multi-color sapphires join together in this fine silver pendant. Did you know that sapphires and rubies are varieties of the same mineral, corundum? Corundum is a transparent mineral and gets its color from metal impurities trapped in the crystal matrix. Chromium gives corundum a red color and voila: we have ruby! Sapphires are mostly known as being dark blue, but in fact they occur in all colors of the rainbow.