This 18K yellow gold Rosa de la Cruz Rainbow sapphire earring features a pink, purple and blue sapphire, set in polished 18K gold. It has a butterfly back closure and comes as a single. Actress Gene Tierney said, ‘Cars, furs, and gems were not my weaknesses.’ Well Gene, that’s because sparkling stones like the ones on this Rosa de la Cruz earring are not a weaknesses - they're awesome.