Incredibe Art Deco Stag Beetle pendant.
Modelled in high carat gold, his abdomen enamelled with shades of blue and green to get that bug like irridescent glow. 
His body set with 41 diamonds, a mixture of brilliant cuts and rose cuts.
the largest being the one he holds between his claws which is .2 carats
There are also accents of pink using tiny ruby square cut stones in silver millegrain settings, which, along with his geometrically shaped gold legs, gives him that classic deco appearance.
He also has ruby cabochon eyes, and three graduated ruby cabochons on his bottom.
There is a hallmark to the reverse that I can't place
 
Circa 1920
weighs - 16.8g
measures - 59mm x 27mm
Condition - immaculate