Does anyone know a company that tags things with a V cut into a piece of shell?

[evelyb30]

This is a recent piece, sponge coral and maybe turquoise. Definitely sterling.  The hang tag is a square piece of shell with a V cut through it with a laser.

 

[evelyb30]

No dice, eh? 

[evelyb30]

I found a few other pieces with the same label; no one knew whose those were either.