I truly don’t know what this is but I believe it to be glass since it isn’t terribly heavy. It is mounted in a shadow box setting. Check out the pictures to see the glow of these nuggets. Overall size of cufflink face is ¾” square with a silver tone setting and wrap. Never seen anything like this set.
All my cufflinks and jewelry are sold in used, pre-owned condition. Vintage and Antique items by nature have some wear, imperfections and signs of use and age.
Different Glow Glass Wrap Around Silver Tone Cufflinks Cuff Links