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Black Agate Gems
Agate is a member of the quartz gem group that occurs in many colors and patterns. Other members of the quartz family include agate geode, fire agate, banded agate, jasper, onyx and more. Black agate is highly sought after for its color, as there are not many gemstones that occur in black. Like other varieties of quartz, it is considered durable and versatile, making it great for any kind of jewelry design. Agate gems can be found faceted, but are more often cut en cabochon. Browse the largest selection of black agate gemstones. We have calibrated sizes, matching pairs and matching lots of black agate stones from many origins. To find the black agate gems that you require, filter the results further by shape, size, carat weight, price and other factors. All items shown are available and ready to ship.
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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

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

Note: 1ct = 0.2g

Size Comparison Chart