1. Rubies are one of only four precious gemstones in the world – the other three being diamond, emerald, and sapphire.
2. Corundum is a mineral that forms rubies and sapphires. If corundum holds a rich red color, it is a ruby. If it is any other color, it’s sapphire.
3. Ruby comes from the Latin word “Rubens,” meaning “red.”
4. Corundum scores 9 on the Mohs scale of mineral hardness, making ruby and sapphire the second-hardest gemstones after diamonds.
5. The richest and most valuable color of a ruby is “pigeon red,” a combination of deep red with a shade of blue.
6. Inclusions, which are found in most rubies, play a huge role in determining a real ruby from a synthetic one.
7. Though inclusions in ruby can sometimes add to the beauty of the stone, it can sometimes lead to a huge drop in price if it affects its clarity.
8. Most rubies are not sold in their original state but undergo heat treating.
9. Red spinels used to be mistaken for rubies. It was only after the 18th century that the two stones were found to hold distinct properties.
10. Garnet is combined with pinkish-red glass to create a stimulated, valuable-looking ruby.
Ruby is a true gem, quite literally. From jewelry to literature, rubies have played a significant role in inspiring artists of different domains. Because of that, the ruby will always be considered a precious stone – both inside and out.