When you've got all those details on lock, it's time to figure out where to shop. The Internet is a great place to cop all your favorite pieces from the comfort of your home. But you should be aware of all the fake websites claiming they sell the best vintage—you know those hustlers. Sometimes it's easy to spot an illegitimate site from its name, other times it's not. The biggest give is the price of the vintage "designer" jewelry. If you spot a Cartier watch for less than $100, you're definitely shopping on the wrong website.
The Vintage Frames Company and Dope Couture both carry a ton of vintage designer jewelry—celebs go here to cop theirs. You can also go to eBay. There are reputable sellers on the site; you just need to do your research and check their feedback before making the purchase.