Historically masquerading as royalty, spinel is a magnificent gemstone that was frequently mistaken for ruby and sapphire for centuries—most famously in the British Crown Jewels, where the legendary “Black Prince’s Ruby” is actually a spectacular red spinel. An independent magnesium aluminum oxide mineral, spinel is highly treasured by modern gemologists for its exceptional clarity, high refractive index, and single refraction, which give it a remarkably crisp, bright brilliance. It naturally occurs in an incredible kaleidoscope of colors, ranging from intense, fiery crimsons and vibrant pinks to cool lavenders, deep blues, and trendy metallic grays. Offering fantastic durability with a hardness of 8 on the Mohs scale and almost never requiring heat treatments, this once-overlooked gem has rightfully claimed its place as an elite, completely natural favorite for fine jewelry.