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This is a vintage 1919 pendant by Rene Lalique (engraved signature) called Cigognes--three cranes dancing in a swirl of wings. This gorgeous pendant looks best from its polished side. The other side where the design is cut and etched matte has a slight flake at the very bottom left edge, right above the signature. You can see this in the images. It really is hard to spot when worn, but you can feel it. The piece measures 2 & 1/8" by 1 & 7/8" by 1/4" and it has been (not by me) enhanced by a 16 inch 14 karat gold chain for wear.
Pendant--Lalique Crystal 1919 Cigognes--Three Swirling Cranes on 14 Karat Chain