Thistle collar plague 2 Thistle collar plague. Thistle pattern in enamel. Its spiky stem is inspired by Lalique, which is diamonds. Related Posts:Rene Lalique Art Nouveau jewelleryRalph DeRosa costume jewelryScottish Luckenbooth broochFrench Art Nouveau jeweler Gabriel Argy-RousseauPlastic jewellery by Alexandra BurkinaArt Nouveau style jeweler Lucien Gaillard