These are fantastic Mother Of Pearl findings.  They are 10mm for the entire width.  My Bambicrony Shy (YO sized of 10") is modeling.  The Mother Of Pearl is a natural product with very slight variation to it.  Set in this, is a Vitrail light Swarovski rhinestone.  These give off subtly different color depending upon the surrounding lights and colors.  It does have an overall amythyst color to begin.

These will be sold singly, one stone.  This is my version of a Vintage, girly steampunk look.