Art Deco Diamond and Ruby Greek Key Brooch of 18k Gold

A refined Art Deco era brooch (circa 1920), designed as a geometric rhombus motif set with calibre cut rubies and single cut diamonds arranged in a Greek key pattern and accented by a luminous post set pearl. The piece is mounted 18 karat gold with a platinum overlay beneath the diamonds, a technique favored during the period to enhance the sparkle of diamonds while maintaining the strength and warmth of gold beneath.

The brooch measures 0.75 inches by 1.3 inches wide and weighs 1.53 grams, offering a delicate yet distinctive presence when worn. It is presented in great antique condition, with stones secure and surfaces well preserved.

Gemstone identification has been confirmed using Raman spectroscopy, a non-destructive analytical technique that provides a precise chemical fingerprint to verify authenticity. Metal authenticity has been professionally verified using XRF (X-ray fluorescence) analysis and traditional jeweler’s acid testing, confirming platinum-topped 18K gold construction.

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