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Onyx, Sard & Sardonyx are all varieties of the micro-crystalline quartz chelcedony. Onyx is similar in look to agate, but has straight rather than curved bands. Sardonyx is commonly brown, brownish red, and white in color. The most common uses for sardonyx was seals for wax, cameos in jewelry and as the birthstone for the month of August.
Sardonyx's Color-The layers in this stone range from translucent to opaque. The stone varies in color, too. It may be white or gray, ranging to many colorful varieties. Sardonyx stones usually contain flat-banded, white and brownish-red bands.
Sardonyx is an onyx mineral that is brownish and sard. The minerals or rock forms are made into stones and Gems and used for jewelry, decoration and many other ways.
The two August birthstones are peridot and sardonyx.
It can mostly be found in the Lake Superior area or in Oregon. If you are looking for them in the USA
Ruby is the traditional birthstone for July. Alternative choices are sardonyx and carnelian.
Peridot and Sardonyx are the two gemstones for August birthstones.
I don't know for sure but it was probably a Peridot or a Sardonyx considering these are his birthstones
I wouldn't say that any gemstone is unsuitable for any particular zodiac sign. The gemstone Sardonyx is ruled by Virgo.