French Art Nouveau 925 Silver and Malachite Jabot shops Lapel Pin c1900

A stylish French Jabot Pin with an organic Art Nouveau design fashioned in 925 silver decorated with a large and beautifully marked good quality malachite cabuchon. The pin has a cap held on a chain. The shops reverse has what appears to be a French hallmark showing the maker's initials PK in a lozenge, alongside a rectangle containing 'w925' and then two indistinct quality marks. The item measures 5" long. In excellent condition.