Purchased over 30 years ago for a wedding reception and used once or twice. The clasp can be adjusted with a screw. I haven't worn them since I got my ears pierced, but I think they're in good condition. Outer diameter: 2.5 cm Pearl-like part: 1.5 cm I am looking forward to purchases from those who understand that this is a used item. I will pack it carefully to prevent damage, but I will not accept returns or cancellations if it is damaged during shipping. Please understand this before purchasing.