Swarovski Fire Opal Crystal Stud Earring - 925/10 Silver Filled Ear Post Model # MJ-E139 Materials : Swarovski Fire Opal Crystal, 7.2mm 925/10 Silver Filled Ear Post & translucent stoppers Measurements : Diameter : about 7.2mm, post length - about 10mm Handmade Stud Earring designed by Martiana Jewelry.