Arkansas quartz is some of the cleanest quartz in the world rewarded the grade of “AAA” gem quality. Quartz is a Mohs 7 hardness out of 10 that makes this a durable stone for jewelry. 8x6mm emerald barrel cut Arkansas Ice Quartz™ set in claw prong open back setting hung from Italian sterling silver round lever-back ear wires (approx. 27mm hanging length)