Large oval-shape brooch entirely paved with circular-cut diamonds and adorned with sinuous lines set with calibrated sapphires (some of

Large oval-shape brooch entirely paved with circular-cut diamonds and adorned with sinuous lines set with calibrated sapphires (some of them to re-set)
In the center, a diamond of approximately 3 carats
(L-VS2) in between a drop of :
- two diamonds of approximately 2 carats each (SI1)
- two diamonds of approximately 0,60 carat each (SI1-P1) and
- two diamonds of approximately 0,50 carats each
Setting in openwork engraved silver
Work from the 1915s-20s
Dimensions : 3 x 9 cm
Gross weight : 24,2 g