Polymer claim in dark bronze, gray and white with an opalescent glitter is marbled, shaped into long rectangles, 1.5" x 0.75" then sealed in resin.  The earrings use silver-plated fishhook earwires and are 1.5" long.  
 
All metal used is hypoallergenic, nickel-free, and is sterling silver, silver or gold-plated, or stainless steel unless noted otherwise. Every item is handcrafted, custom-made, nothing mass-produced.