Clear Quartz, Black Onyx, Or Alternating Gemstone Beaded Link NecklacesNew without tags These lovely necklaces feature black onyx, clear quartz, or a combination of the 2. The black style features 8 and 12 millimeter smooth and faceted rounds. The clear quartz style features 8 and 14 millimeter faceted rounds. The alternating version mixes 8 millimeter quartz with 12 millimeter onyx. The necklaces are all 20 inch standard but can be made other lengths upon request. They close with toggle clasps. Check out my other