Hello, everyday cool. We hand-cast a genuine, baroque pearl, formed it into a seamless circle and shaved down it's width to create the perfect, everyday stackable ring. We prefer it as a double stack, but must admit it's super spectacular on it's own as well. All BIKO pieces are plated in 14k gold or rhodium, over brass. They do not tarnish or cause discolouration on the skin. All earring posts are surgical stainless steel, and hypoallergenic. For increased longevity, keep jewelry clean and dry using a soft cloth. Avoid wearing your jewelry in the shower or during exercise, and wear after applying perfume or hairspray. Protect your piece from rain and humidity. When not wearing, be sure to store inside a jewelry box or soft jewelry pouch, such as the pink branded BIKO pouch provided. Wear your BIKO jewels often, and love them always.