18kt yellow and white gold 18kt yellow gold Two In One diamond single stud earring from DELFINA DELETTREZ featuring 18kt yellow gold, 18kt white gold, polished finish, stud embellishment, claw/prong setting, round cut, white diamond, post-back fastening and for pierced ears. This is a single earring.. Hallmarked in the United Kingdom at the London Assay Office..