The featured colour ring is made of sapphire crystal and has high luster and excellent hardness. It comes in a modern design and has excellent quality.  This sapphire glass flaunts a neat and luxury appearance and makes an excellent component for high end accessory and watch components.

• High-quality sapphire crystal glass
• With anti-impact and anti-scratch features.
• With high electrical resistance.
• With high corrosion resistance. 
• Features great thermal stability.
• Features a high melting temperature of 2030 °C.
• With a high hardness of 9 Mohs, which is second to diamond.
• High quality.
• Excellent component for high end watches and jewellery. 
• Vickers hardness: 2000 - 2500 daN/mm2.
• Optical properties: 1.760.
• Available in customized designs.