Adina’s Tiny Diamond Threader Stud

Brand new, never worn. Adina’s tiny diamond threader stud. This says 14K and was sold to me as 14K but this is actually just brass. I have one and it tarnished. This is a 4 prong setting. I am selling at low price because it’s not gold. I did bring to a professional jeweler who said the diamond appears to be lab created. I have a few for sale, each listed separately because each differs slightly. *This has one prong that is slightly offset.