❤️ A ruby by any other name would look just as red ❤️ Rubies are the red variant of the mineral corundum. Any other colour of corundum is called a sapphire 💎 That’s right, sapphires are not always blue! They can be any colour of the rainbow. Except red. That’s when it becomes a ruby. The red in ruby is caused by chromium ions caught up in the crystal structure 🔬 The presence of chromium means that rubies will fluoresce (glow) under a blacklight. They will also look much brighter in the sun tha