"Korloff, Harlequin Gold Ring"
KORLOFF, Yellow gold bangle ring decorated with polychrome enamel motifs (red, green, blue) studded with four small brilliant-cut diamonds. 1980-1990Signed: Maison Korloff "KK"Metal: 750°/°°° (18K) yellow goldNature of stones: four brilliant-cut diamonds (total weight approx. 0.16 carats)TDD 53Ref. 31100087 "The Maison Korkoff is located at 12 rue de la Paix, in Paris, its workshop is in Lyon. Founded in 978 by David Paillaseur, the company takes its name from an eponymous Russian black diamond. " Source Dictionary of jewelers, jewelers and goldsmiths in France from 1850 to the present day, Rémi Verlet, Editions Gallimard, L'Ecole des joailliers, 2022. 
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