Although unsigned, this pendant is similar to the whistle pendants designed by Harry Winston. Set with various gemstones (amethysts, lapis-lazuli, turquoises, diamonds, etc...), these pendants echoed the famous line of American actress Lauren Bacall in 'To Have And Have Not' (1944):

You don't have to say anything, and you don't have to do anything. Not a thing. Oh, maybe just whistle. You know how to whistle, don't you, Steve?