This 3 MM Round Prong May Birthstone Emerald Post Stud Earrings is 14K Yellow Gold. Approximate item weight is 0.17 grams. Length is 3 MM. Width is 3 MM. Earring closure is post and push back. Emerald stone type. 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.