6.5=61/2
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9.0 Mohs Hardness scale
The Mohs mineral hardness scale is an ordinal scale.
The answer depends on what aspect of the scale you wish to measure: its hardness, reflectivity, mass, density, surface area, thickness, etc.
Emeralds are compound of Boron, Aluminum and silicate. They are far less tougher than diamonds. Measured on mosh scale of hardness for minerals emeralds value is less than 8.0. On the same scale hardness of diamonds is 10.00
The Mohs Scale of Hardness measures how well a substance resists scratching by another material.