Antique buying Shirt / Collar studs x 15 Mother of Pearl ..not copies !

buying A fabulous card from my collection of 30 + years ! There are 2 carved / sculpted examples ..one of a Greek god and the other the theatre masks of tragedy ( ? )
This stunning selection of 15 unique shirt studs were worn as adornments to both ladies and gents blouses and shirts.
All are dating from the 19th. Century and are in wonderful condition. There are very few to find nowadays…
Sizes range from 40.0 millimetres ( largest ) to 20.0 millimetres.