14K Yellow Gold Smokey Quartz Stud Earrings Smokey quartz birthstones are featured in these earrings. The basket bezel stud earrings contain two 4mm round genuine smokey quartz birthstones and are crafted of 14K solid yellow gold. The stud earrings contain 14K yellow gold post backings for a secure, comfortable fit. These bezel set smokey quartz stud earrings are a perfect addition to any jewelry lover's collection.