Vintage Anson Tie Tack and Cuff Link Set - Mother of Pearl?

Vintage Anson Tie Tack and Cuff Link Set - gold tone and what I believe it may be Mother of Pearl (?), but this is only my guess. I cannot confirm this, so please view carefully and you decide. They are in great condition with the tie tack missing the back lock in clasp part, but otherwise nice, clean condition. Box does show normal vintage wear. Please refer to pictures for approximate size.