This Genuine Diamond Screw Back Stud Earrings, (0.81 CTW) is 14K stamped yellow gold. Approximate item weight is 0.28 grams. The item dimensions: length - 5 millimeters (0.20 inches); width - 5 millimeters. And the earring closure is post and screw back. Caring for your gold jewelry: to keep gold shining and scratch-free, avoid contact with chlorine and other harsh chemicals. Do not wear jewelry during rough work and be sure to store it in a fabric jewelry box or pouch. To clean gold jewelry, use warm water, a mild soap, and a soft-bristled brush, if needed.