Blue gemstones have historically commanded premium prices due to their association with royalty and their psychological impact as symbols of tranquility and trust. The finest specimens exhibit exceptional color saturation with neither grayish nor greenish undertones, creating pure blue hues that are particularly rare in nature. Gems like Kashmir sapphires, Paraíba tourmalines, and certain blue diamonds represent the pinnacle of collecting, with prices reflecting their extreme rarity and perfect crystalline structure. The demand for natural, untreated blue stones continues to rise as treatments become more sophisticated.