Hardness and Refractive Index
Sapphire is a fantastic choice for an engagement ring, as it is rated 9 on the Moh's hardness scale, compared with diamond, which is rated 10. It is considered “excellent” for everyday wear, as is diamond. However, we do not recommend setting colorless sapphire in an engagement or wedding ring. Unlike diamond, which is highly dispersive, sapphire has a lower refractive index, so colorless sapphire appears dull and lifeless. The refractive index of sapphire is still among the highest of all gemstones, and lightly colored sapphires can be extremely beautiful.
Sapphire is a fantastic choice for an engagement ring, as it is rated 9 on the Moh's hardness scale, compared with diamond, which is rated 10. It is considered “excellent” for everyday wear, as is diamond. However, we do not recommend setting colorless sapphire in an engagement or wedding ring. Unlike diamond, which is highly dispersive, sapphire has a lower refractive index, so colorless sapphire appears dull and lifeless. The refractive index of sapphire is still among the highest of all gemstones, and lightly colored sapphires can be extremely beautiful. 
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