Gold brooch with rubellite, sapphires, emeralds, and diamonds

18k yellow and white gold. Carved rubellite (variety if tourmaline) featuring a mask with gold headgear embellished with oval sapphires, navetta and cabochon shaped emeralds, navette and brilliant cut diamonds.  

N. 16 diamonds estimated to weigh a total of approx. 0.55 ct, F-G colour, VVS-VS clarity, n. 06 blue sapphires  estimated to weigh a total of approx. 12.00 ct, n. 04 blue sapphires estimated to weigh a total of approx. 1.00 ct as gauged and graded in the mount.
Hallmarked "750 - 468 Roma".
Dimensions: 4.5 x 3.5 cm. Weight: 29.5 g.