size: 15 x 5 mm weight: 3.74 grams material: 14k white gold & platinum *The screwback backings and the clip are 14k white gold, the settings are platinum. gemstones: australian crystal opal 2.40ctw 0.30ctw of natural VS G-H color diamonds Notes from the Curator Crystal opal is defined by its transparency—light passes through the stone, creating a glass-like appearance that makes the play-of-colour appear sharper and more vivid than in opaque white opal. This translucent quality produces a three-dimensional colour-on-colour effect, allowing light to interact with internal structures at varying depths, and the best specimens are often polished on both sides to display their three-dimensional colour play. Australian crystal opals—particularly from Lightning Ridge and the South Australian fields of Coober Pedy—are prized for their clarity and vibrant color play, and this pair presents the oval-cabochon form favored since the Art Deco era. The dual-metal construction—platinum settings paired with 14k white-gold screw-back posts—follows a technique seen in classic Art Deco opal and diamond jewellery, where platinum was reserved for the visible setting to exploit its strength and lustre while gold provided the structural hardware. The total weight of 2.40 carats across two stones places each at roughly 1.2 carats, substantial enough to display the floating iridescence that collectors seek, and the VS G-H diamonds flanking each opal echo the geometric geometry of the period.