14K Gold 18" Black Onyx Bead Necklace

Measures 18"L x 1/2"W x 5/16"H with a lobster claw clasp.All weights pertaining to diamond weights are minimum weights. Additionally, please note that many gemstones are treated to enhance their beauty. Click here for important information about gemstone enhancements and special care requirements.About OnyxOnyx is a variety of chalcedony quartz that features a fine texture with a smooth black color. Some onyx can display white bands or ribbons against black or brown backgrounds. Mined in Brazil, India, California and Uruguay, most onyx today is color-enhanced to increase its depth of color. It ranks a 6.5 on the Mohs Scale and is an ideal stone for carving. In fact, it is a favorite material of lapidary artists.