What’s the first thing that comes to mind when you think about precious stones? For most people, it’s diamonds, rubies, sapphires, and emeralds. These are the “big four.” But it turns out that there’s a world of interesting gemstones out there. And each of them has specific properties that could improve your outfits – and your life. Opal Opal is perhaps one of the most interesting stones you can buy because of the way it forms. The material is made of the fossilized remnants of ancient shells – a bit like limestone – that have become opalized over time. Many …