Goldtone Crystal Heart Green Shamrock Necklace and Clover Earrings Jewelry Set. Goldtone Crystal Heart is approximately 10mm tall. We use Swarovski Crystallized Elements. Silver tone faceted ball chain necklace is 18 inches long with a spring ring clasp. Green Crystal Post Earrings have a steel post and a plastic comfort ear nut. Sweet green Irish Shamrock is hand painted enamel and is a famous symbol of Ireland and St. Patrick s Day. The symbol was used be St. Patrick to spread Christianity as a symbol of the Holy Trinity.