Art Nouveau "constantia" Transformable Brooch – Diamonds, Pearl, 18k Gold And 850 Platinum

"Constantia" Art Nouveau Brooch-Pendant

This Art Nouveau brooch-pendant was crafted in 18k yellow gold and 850 platinum. It features a floral motif adorned with rose-cut diamonds, punctuated by round old-cut diamonds.
At its centre sits a white cultured pearl, while a detachable drop formed by a cascade of three old-cut diamonds adds movement and brilliance.
A removable pin and two discreet rings allow it to be effortlessly converted into a pendant.
A creation from around 1910, quintessentially Art Nouveau in aesthetic.

Specifications:
Dimensions: 3.7 × 3.9 cm
Pearl diameter: 4.1 mm
Stones: cultured pearl, old-cut diamonds and rose-cut diamonds
Total weight of principal diamonds: approx. 0.80 ct (including 0.30 ct for the drop diamond)
Weight: 8.2 g
Metals: 18k gold – 750/1000 and platinum 850/1000
Hallmarks: owl (18k gold) and mascaron (platinum)

Condition
In good antique condition, typical of the early 20th century.
The central pearl was likely replaced; pierced through, it probably originated from an antique necklace, with the holes later filled with care.
The jewel features charming millegrain settings and a naturalistic composition typical of the Art Nouveau period — a historic piece where delicate craftsmanship takes precedence over the size of the stones.

Reference: 212