14 ct White Gold 2 ct CZ Studs. The Yellow Door Cubic Zirconia stud earrings are custom cut and polished by hand. Each stone is fully faceted (no less than 58 facets) like a diamond. The girdle (the outside edge of the top of the stone) on The Yellow Door stud earrings is a fine, lean and polished line. Inferior cubics have a wide frosty girdle. There are normally three grades or cuts of Cubic Zirconia: commercial, regular and custom. The Yellow Door uses only the highest grade Cubic Zirconia available, "Custom Cut Plus." A step above all others, your Yellow Door stud earrings in Cubic Zirconia are undetectable to the jeweler's naked eye. The Yellow Door's stud earrings are hand set in 14 carat gold by master jewelers, the same jewelers who set diamonds. Like a diamond, a Yellow Door diamond stud earring is forever.