
June Birthstones - Moonstone, Pearl & Alexandrite
The modern birthstones for June are the Moonstone and Pearl. Moonstone has a 6.0 hardness on the Mohs scale. Its name is derived from a visual effect, or sheen, caused by light reflecting internally in the moonstone from layer inclusion of different feldspars. Moonstone is feldspar with a pearly and opalescent luster.
Pearls have been highly valued since antiquity. Just like the shell of a mollusk, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls (baroque pearls) occur. The value of the pearls in jewelry is determined by a combination of the luster, color, size, lack of surface flaw and symmetry that are appropriate for the type of pearl under consideration. Among those attributes, luster is the most important determination of pearl quality according to jewelers. All factors being equal, however, the larger the pearl the more valuable it is. Large, perfectly round pearls are rare and highly valued. Teardrop-shaped pearls are often used in pendants.
See more Moonstone, Pearl & Alexandrite here.

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