Ruby gemstones are among the world’s most prized and durable gems, famous for their vivid red color, fascinating natural features, and remarkable history in both jewelry and science. Here are ten interesting facts about ruby stones followed by a fun trivia quiz. How many can you get right?? Ten Ruby Gemstone Facts 1. Ruby Is the Red Variety of Corundum Ruby is a variety of the mineral corundum (aluminum oxide). All other colors of gem-quality corundum are classified as sapphire, not ruby. What makes ruby different is the presence of chromium, which gives it its red color. 2. Rubies Rank 9 on the Mohs Hardness Scale Ruby is extremely durable, ranking…