Guide to Birthstones: August – Sardonyx, Peridot, And Spinel
August is one of three months that has three birthstones — sardonyx, peridot, and spinel. Sardonyx combines alternating layers of sard and onyx–two kinds of the mineral chalcedony–to create red, zebra- striped stones with white bands. Colors range from yellowish red to reddish brown, depending on how much iron oxide is present. Registering a 6.5, […]
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