Don’t worry. This isn’t a repeat of Dressgate, nor is it a matter of perception. Iolite, or cordierite, really does change color depending on where the light is coming from. Find out why.
Many people know that diamond is actually pretty common when it comes to gemstones (you can find millions of them in your typical candle flame), but who among us can actually name any that are rarer? Here, we present to you a collection of ten of the rarest gemstones on Earth.