TierraCast® earring post findings with titanium ASTM F67 Grade 1 10mm long posts with 0.7mm (21 gauge) diameter and gold plated Britannia pewter settings. Each stepped crystal setting from the You Asked Collection is already filled with a sparkling sapphire blue 34ss XIRIUS Swarovski crystal. 34ss (stone size) is approximately 7mm. Under the crystal, a closed drop loop lets you add your own dangles to complete DIY earrings. These earring findings are made in the USA! They meet the EU Nickel Directive, which means they're safe for most people with metal allergies. Order earring backs separately to get your favorite kind of clutch.