1940s, maybe 1950s. And here you can see how the contra enamel. And the reason why that's done is so that the brooch retains its three-dimensional form. It is actually gold, it's 18 karat gold.

(IDEX Online) - An historic diamond brooch from 1789, set with a lock of King Edward IV's hair, has sold at auction in ...

Jean Schlumberger by Tiffany Hummingbird brooch in 18K yellow gold and platinum with black enamel, yellow sapphires, spessartines, rubies and diamonds, and Jean Schlumberger by Tiffany Hummingbird ...