Vintage brooch - white gold with diamonds and onyx

Brooch - white gold with diamonds and onyx.
Vintage brooch made in the mid 20th century.
Manufacturer's signature: LD

4 diamonds (4 times 0.01 carat) in single cut.
Purity of diamonds: VS1
Diamond color: G-H
Flat cut onyx (30.5 x 5.3 mm).

White gold sample 585.

Brooch dimensions: 43 x 5 mm
Weight: 5.23 g.
Very good condition.