Sapphire Cup The Sapphire Cup is a premium cup manufactured from high-purity sapphire crystal, combining the exceptional hardness and durability of sapphire with a clear, elegant appearance. With its highly transparent body, smooth polished surface, and refined cylindrical design, it is suitable for luxury products, specialty applications, display, and customized precision components. Sapphire is a single-crystal form of aluminum oxide (Al₂O₃) known for its high hardness,