Some would call this a faux moon glow stone. I believe it is a thermal plastic they used in the late 50's early 60's. It is very denim blue and will compliment any French cuff shirt or blouse. Both men and women could wear this set. It is in good condition with no maker's mark. Overall size is 5/8" in diameter
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.
Bold Tone Denim Blue Thermal Plastic Stone Cufflinks Cuff Links