18ct bi-colour gold, yellow sapphire and diamond brooch, Buccellati. Estimate $22,000 - $32,000. Photo Sotheby's.

Centring a cushion-shaped sapphire weighing approximately 8.50 carats set in a textured collet framed by an open work cluster of foliate motifs accented with circular-cut diamonds mounted in a sculpted gold surround bordered by a scalloped filigree foliate pattern decorated with circular-cut diamonds, approximately 39 x 43mm, signed Buccellati, Italy, numbered 96. 

Sotheby's. Important Jewels, 31 Aug 2015, Sydney, 6 PM