Some examples of jewelry from the 17th century:
Amethyst and gold pendant, late 16th century – early 17th century
Possibly worn as an earring or in the hair. Part of the Cheapside Hoard
Museum of London
Lettice Knollys, 1613, artist unknown
Portrait of Elizabeth Poulett, 1616, by Robert Peake the Elder
Oil on panel, 78.7 cm x 63.5 cm
Denver Art Museum
Portrait of Lady Frances Devereux, later Duchess of Somerset, 1628, by Marcus Gheeraerts the Younger
Oil on panel, 67.6 cm x 52 cm
Strachan Fine Art
Pendant with citrine, gold, pearls, c. 1650
Kunsthistorisches Museum Wien, Kunstkammer
Unknown woman, 1671, by Pieter Nason
Casket of jewels on a table, principally of German Origin, 1600-50, by Pieter Gerritsz van Roestraten
Oil on canvas
Rafael Valls Gallery, London
Gold and amethyst pendant, c. 1680
Newbury, UK
If you know about missing informations of origin or copyright please let me know!