The featured watch ring is made of sapphire crystal and has high luster and excellent hardness. It comes in a engraved design. This transparent sapphire glass has a hardness that ranks nine out of ten in the Mohs scale, making it the hardest material second to diamond. It is also designed to be anti-impact, anti-scratch. 

• Material: Sapphire Crystal
• Watch Case
• Neat and clean appearance 
• Feature: Maximum luster and excellent hardness
• Craftsmanship
• High quality
• Vickers Hardness: 2000 - 2500 daN/mm2
• Optical properties: 1.760
• Available in customized designs
• This sapphire crystal glass is an ideal raw material for high-end watch designs.