Daily gemstone 5: Ruby
^ the sunrise ruby, the most expensive ruby, and the most expensive non-diamond gemstone
ruby is one of the two varieties of a mineral called corundum that is considered a gem, the other being saphire (corundum containing various other elements). rubies are pinkish-red to blood-red in color. they strike a 9.0 on the mohs hardness scale, making it one of the hardest natural gems.
















