I've never been to the British Museum in London..
but thanks to the wonders of modern technology, almost 2 million objects in their collection can be accessed via the internet in their online collections database.
For anyone interested in jewelry history or even art history in general, this is a bona fide treasure trove. Their jewelry and metalwork holdings are spectacular to say the least, and I am especially fond of the 15th-17th century prints of Renaissance jewelry designs:
Just remember when searching the database, you need to use British spellings (jewellery instead of the American jewelry). I cannot tell you how much time I've spent just virtually cruising through this collection. Have fun and happy searching!
All for now,