Spinels are natural gems that are highly prized for their brilliance and beauty. They are distinguished by their vitreous lustre and vivid colour, which can vary from red to pink, blue to violet, green to yellow, or black to colourless. Spinels are often confused with other gemstones such as rubies or sapphires because of their similar colour and appearance. They have been used in jewellery for centuries and are highly prized for their rarity and quality.