What if I Started my own Jewelry Line?

Recently I met with David Benlolo at his midtown studio, where he holds intimate jewelry-making workshops. It was amazing to hear the possibilities alive in the jewelry world. Now I'm excited to learn the skills I need to launch my own jewelry line!
I'm looking forward to up-cycling vintage jewelry that I can find in my own collection and out in the world. Where should I start my search for vintage gems?
Have you embarked on a new creative endeavor recently? I would love to hear all about it! Inspiring stories like ours keep each other going.