Tourmaline Bar Pin

​​18 k Bar pin with square cut tourmaline center.  Tourmaline is 8.02 mm square. The pin bears 750 purity mark as well as a "M M" makers mark.  The tourmaline has minor wear on one edge of the table, visible under magnification (see image).
Height of pin 7.10 mm (Except center tourmaline 8.77 mm wide including mount)
Width of pin is 70 mm
Total Weight of pin 0.185 Oz(5.25 g)