Platinum Rectangular Geometric Brooch Centering an Emerald Cut Pink Sapphire

This striking platinum rectangular geometric brooch exemplifies the elegance and precision of early 20th-century jewel design, centered by a vivid emerald-cut pink sapphire weighing approximately 2.80 carats. The sapphire’s crisp geometry anchors the composition, its saturated pink hue providing a dramatic focal point against the cool brilliance of platinum. Measuring 1 1/2 by 2 inches and weighing approximately 13.7 grams, the brooch has a refined architectural presence that feels both sculptural and impeccably balanced.

Surrounding the central stone is an intricate arrangement of diamonds totaling approximately 4.60 carats, including eight baguette-cut diamonds, two half-moon-shaped diamonds, and an impressive suite of one hundred ten old European and single-cut diamonds. This combination of cuts creates a dynamic interplay of line and sparkle, with the baguettes and half-moons emphasizing structure while the smaller diamonds add depth and luminosity. The result is a richly textured surface that captures light from every angle without overwhelming the central sapphire.

Accompanied by American Gemological Laboratories (AGL) Report No. 1143332, the pink sapphire is confirmed to be of Myanmar (Burma) origin, with no gemological evidence of heat or clarity enhancement—an important distinction prized by collectors. The brooch is offered from the Estate of Sally G. Chubb of Bernardsville, New Jersey, adding distinguished provenance to an already exceptional jewel. Offered at auction, this brooch represents a rare opportunity to acquire a highly refined sapphire and diamond jewel of confirmed quality, strong visual impact, and enduring sophistication.