The pair has a silver tone round setting of 5/8” diameter. They could be worn by both females and males on any French cuff shirt. A great pair that is very versatile is in great condition with no makers mark. It depends on the way the light reflects off of the surface but I would say they are grey to a light black.
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.
Faux Mother of Pearl Grey Cufflink Cuff Links