The sapphire has a magnificent color like the sea with a round cut. It catches people's eyes with its transparency, constancy and durability. The sapphire stone is a great gift for your lover implying mutual understanding and indestructible trust.

• Hardness: 7-7.5.
• Refractive index: 1.61-1.64.
• Density: 3.0-3.3g/cm³.
• Wax casting: suitable 100% .
• Melting temperature: 1,600-1,750℃.