Vintage Sezgin Turkish 925 sterling silver brooch pin from Turkey with ornate ethnic design.
The blue cab is the color of lapis lazuli but it hasn't been tested. 
It may just be dyed stone.
The blue in the stone is a little warmer in real life.
C-clasp back.
Stamped "Sezgin 925 on the back.
Total weight is about 13g.
2 1/16"W x 1"H.
The cab is about 20mm x 15mm and is about 3mm at the highest point above the bezel.
The sterling silver metal is darkened with tarnish.
The tarnish will be left as is for the buyer to decide whether to polish it off or not.
The stone has some scratches and small chips.
The pin has some bends.