Vintage ball ring in black gold, pink tourmaline and black and white diamonds

A substantial 18k black gold (750/1000) ball ring set with black diamonds on the band. The eagle's beak prongs, set with white diamonds, hold a raspberry pink tourmaline cabochon (20 x 17 x 9.5 mm, approximately 27 carats), likely a rubellite variety. Contemporary French work from the Leiba Kiecki workshop (LK and a different M mark). The eagle's head hallmark for 18k gold is present.

Finger circumference 51
Gross weight: 22.23 grams