Are there any special properties of a ruby?

Yes, rubies are known for their striking red color, which is primarily due to the presence of chromium. They are among the hardest gemstones, scoring 9 on the Mohs scale, making them highly durable for jewelry. Additionally, rubies are believed to possess various metaphysical properties, such as promoting passion, protection, and vitality. Their rarity and beauty also make them highly valued in both jewelry and investment.