Set of three yellow gold brooches, one with...

Set of three yellow gold brooches, one with a guilloché snake motif holding an oval mother-of-pearl plate, the second twisted circular decorated with pearls (one missing), the last adorned with a miniature mother-of-pearl motif representing Madame de La Vallière in an entourage of flowers, foliage and palmettes set with pearls. A circular white gold brooch set with a pearl (as it is) is attached