TierraCast® earring post findings from the You Asked Collection are made in the USA with titanium ASTM F67 Grade 1 10mm long posts with 0.7mm (21 gauge) diameter and bright rhodium plated Britannia pewter settings. These stepped crystal settings are filled with a shimmering birthstone assortment of 34ss XIRIUS Swarovski crystals. 34ss (stone size) is approximately 7mm. Under the crystal, a closed drop loop lets you add your own dangles to make DIY earrings. Order earring backs separately to get your favorite kind of clutch.