Board Thread:General Discussion/@comment-4224349-20150326205101/@comment-26062541-20150401024339

I think a gems defensive properties may depend on the hardness rating of the specific gem. Pearls for example rank at a 3 or 4, so there's a good chance of her being physically the weakest. Now quarts on the other hand can range up to 7 on the hardness scale, so Jasper and Amethyst's crazy strength makes complete sense.