Protective device to prevent damage to signet ring, particularly the stone.

Onshape CAD Model:

https://cad.onshape.com/documents/f7721c27abdf488c957d88d6/w/77ff11ba6de967d762010fa4/e/64d1044af541b000c69c0a78?renderMode=0&uiState=652fb9a4b5e7544fefc2f37f