This is a 1-3/4” in diameter sterlng silver pendant that I have acid etched the pattern using acid. The center stone is pottery glazed with cobalt blue with a pale blue swirl. 
These look great on the optional 50 stand neckwire as shown in the first image.
If adding the neckwire to any pendant you may use the code NECKWIRE for a discounted one at $35-this only applies when purchasing a pendant.

This one is sold but I can do something similar in it and whatever color you might like

Etched Round Pendant with Blues