An interesting look at 25 Jewelry Things you might not have known about. There are interesting facts about Diamonds, Rubies, Pearls, Gold, and Silver jewelry that I never knew about. I knew there wasn’t a lot of Gold that had been mined in the world but I had no idea how it compared in size to the Washington Monument. I am familiar with the cost of Diamond Engagement Rings as I made that once in a lifetime purchase years ago.