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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (0): Black Agate Gems - Agate Clear All
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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.
Certified Customer Reviews
Overall Rating -> 10 star ratings
Huge variety including unusual cuts and colors
Posted By Steffie in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I have bought several stones and am very happy with the price points, selection and speed of delivery. Sometimes the quality is not quite what I expected but given the prices, I am overall satisfied.
Posted By in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
offer military prices
Posted By Frobb1968 in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Trustworthy company & site, great products.
Posted By KM in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I have been ordering from GemSelect for at least 6 years. Every single order was perfect - every item was as advertized, in perfect condition and arrived well within the specified time frame. I have recommended them to several friends.
Posted By Jim in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Excellent company with excellent website!
Posted By Marcy in August, 2018
Source: Bizrate
English speaking customer support only

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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