The cufflinks are stamped with "PAT." The orange ones, are they stone or plastic? Unclear. The smoky quartz was purchased in Korea over 30 years ago. I believe the stone is genuine, but the clasp is just plated. They have been in a drawer for a long time. All of them are old items. Please consider purchasing only if you understand this. Please refrain from purchasing if you are overly sensitive. They are being sold as a set. You can see other men's items I have for sale from the hashtags below. #Cufflinks #PAT #TieClip #SmokyQuartz #Antique #ShowaEra #ChuntaroMensItems 3500 yen ->