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Moss Opal
The name opal was probably derived from Sanskrit "upala", meaning "valuable stone". Moss opal belongs to the category of "common opal", which is opaque, rarely translucent and shows no play of color. Precious opals display rainbow-like hues that change with the angle of observation. Moss opal is a milky white opal with unique inclusions of green hornblende in moss-like patterns. Moss opals get mostly a round or cabochon cut and are best suited for earrings, brooches, and pendants.

Opals are delicate gemstones. By definition opal is hydrated silicon dioxide, always containing three to thirty percent water. Combined with its relative softness with a rating of 5.5-6.5, opal requires some special care. If an opal is allowed to dry, it will crack and fade. Opals are also highly sensitive to sudden changes in temperature and scratch easily.

The most important opal deposits are located in Australia.

There is a long standing belief in the healing power of opal. It is reported to be able to relieve depression and to help its wearer find true love.

Opal is a birthstone for those who are born in October.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

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Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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