A diamond, emerald, ruby and sapphire brooch, by Marchak, circa 1965. Via Bonhams.

Sapphire Brooches
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Sapphire Brooches Sapphire Diamond Gold Sea Horse Brooch Cabochon Ruby, Sapphire & Gold Ring
ENAMEL, DIAMOND, SAPPHIRE, AND RUBY BROOCH, circa 1890. Designed as a butterfly, the wings mounted en tremblant, the body set with one oval sapphire and old-mine-cut diamonds. The wings decorated with plique-à-jour enamel in blue-green tones, and set with four sapphire cabochons. The wing borders partially set with rose-cut diamonds. Probably French.

Refer: https://www.bonhams.com/auctions/22894/lot/520/Shop Now