Mother of pearl is a natural material created by certain mollusks as an inner shell layer. (For example abalone and oysters). Mother of Pearl and Pearl are one of several birthstones for the month of June. Each ring is handmade with a special wire wrapping technique. Rings come in all sizes, but the most common are 5-9, with size 7, 7.5 and 8 being the most common. Choose your size and metal type, both Gold Fill and Sterling Silver do not tarnish with wear, are water proof and meant for day to day wear. Gold Plate and Silver Plate are a hypoallergenic metal alloy with a plastic covering over it, making it an affordable fashion jewelry option.