Vintage 18K Yellow Gold Diamond Set Trumpet with Violin Key Pin

Vintage 18K yellow gold trumpet pin set with nine single cut diamonds and a drop chain supporting a violin key charm. Bright and satin finish with rhodium accent.
Diamonds: 0.05ctw. (Stamped on the back.) Color: G-H, Clarity: VS1-SI1
Measurements:
Length: 10mm (trumpet) and 30mm (including drop)
Width: 23 mm
Weight: 3.9 grams
Marked: K18 and the makers mark