I think that most people buy jewelry for the love of it, not so much for investment. As I'm sure you know, generally speaking, you never can get back the value you paid for a piece.
I know that the exception is really 'high end' pieces of Jewelry, that will be bought as an investment, which are usually not even worn, kept in safety deposit boxes.
Go to a pawn shop and see all the lovely jewelry that is selling for much less than the assessments.
Try selling gold jewelry and see that you are offered to going price of gold.
With silver jewelry, it eBay for you, unless made by a famous designer.
Buy what you love.
I have recently been selling a lot of my jewelry. My husband passed, I've had to change my life, and just don't want so much jewelry that I don't wear.
It's been real eye opening.
Some of my 'high end' pieces are being sold on consignment on a 60/40 split. Some pieces just sold outright for about 50% of what I paid for them. And lots just sold as scrape gold prices.
Silver jewelry even less. Some of the designer marked pieces on consignment, but the rest, I just don't know what to do with it.
I loved collecting it over the last 40 years, but just don't wear hardly any of it anymore.