Ring Size Guide Melia Nae Melira Golden Ring Malia Ring Gold or Silver PRYA Rhea Ring 1CT Melia Nae MALIA Ring( Bl) ULA. Hand made recycled sterling silver. Part of the Lines Collection. Recycled 925 sterling silver Half sizes available upon request Handmade in Athens, Greece Sterling Silver Composition: Sterling silver, often marked as "925," is made of 92. 5% silver and 7. 5% other metals, primarily copper, to increase its durability and strength. Chemical Reaction: The copper in the silver alloy reacts with moisture, oils, and acids on your skin, leading to oxidation and the formation of copper salts. Green Discoloration: These copper salts can then rub off on your skin, causing a green or black discoloration. Harmless: This green discoloration is a cosmetic issue and is not a health hazard. Prevention: To minimize the chances of green discoloration, you can: Keep jewelry clean and dry: Remove jewelry before swimming, exercising, or washing hands. Clean regularly: Wipe down your sterling silver with a soft cloth to remove oils, dirt, and sweat. Apply a barrier: A thin coat of clear nail polish on the inside of rings can create a barrier between the metal and your skin. Storage: keep silver in a dry, tarnish resistant environment