EUGENE-ALFRED LELIEVRE
b.1856
Art Nouveau Brooch 
Gold & diamond
Length: 3.7cm Width: 3.6cm
Maker's mark: ‘EL' with a swan
French. Circa 1900
3 rose cut diamonds
Fitted case
Literature: Cf. The Paris Salons 1895-1914, Jewellery,
volume II: The Designers L-Z, p.81-83.
Art Nouveau Jewelry, Vivienne Becker, 1985, page 223 & 231