Periwinkle Blue Chalcedony Stone Earrings Multi faceted stones Sterling Silver stamped / marked 925 genuine freshwater pearls Measure 2" Periwinkle Blue Chalcedony imparts mental flexibility and verbal dexterity. It stimulates the ability to learn new languages and improves memory. Gives feelings of light-heartedness and optimism. Improves self-perception. elegant jewelry. Wouldn't they make the perfect 'Something Blue' on your wedding day.