Rubies are composed of corundum, a crystalline form of aluminum oxide. What gives rubies their distinctive red color is the presence of chromium within the crystal lattice during their formation. Rubies are one of the four precious gemstones, alongside diamonds, emeralds, and sapphires, and they are highly prized for their intense color, durability, and rarity. Throughout history, rubies have been associated with power, passion, and protection, and they have adorned the crowns and jewelry of royalty and nobility for centuries.
