Opal pendant necklaces are striking gemstones which flash with all the colors of the rainbow. They are made from tiny spheres of hydrated silica; silica being the sand constituent that makes up sand! As they form, tiny droplets of water become trapped within the lattice work of spheres in an irregular pattern. The water diffracts light passing into the gemstone, resulting in the magical play of color, known as opalescence, for which this gemstone is famous!
However, not all opals are the same! There are four broad categories of opal, white, black, boulder and crystal, which differ in their translucency and color of the host rock. They also exhibit different levels of opalescence. And although fashion dictates the changing popularity of individual opal types, certain types of opals lend themselves better to some rather than other forms of opal jewelry. So which form suits what jewelry best?
White opals are the most abundant of these gemstones. They have a milky white appearance which can range from near opaque to translucent. The more milk like the backdrop of the host rock, the harder it is to see the flashes of fiery opalescence within. Their beauty is most readily seen in strong direct light. Their pale appearance and relative affordability means that they are often set, as cabochons, into silver metal for everyday pieces of jewelry.
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