Multi-Stone, Diamond, White Gold Brooch, SANTAGOSTINO. The brooch features full-cut Diamonds (approx. 0.30 carat), enhanced by round-cut pink Sapphires (approx.2.75 carats), further enhanced by carved AMETHYST measuring 8.80 x 8.50 mm to 15.15x12.45 mm, accented by carved Quartz measuring 5.35 x 5.35 mm to 6.60 x 6.35 mm, complemented by round-cut yellow Sapphires (approx. 0.25 carat), set in 18k white Gold, marked Santagostino. Estimate: $2,500 - $3,500.