About 7.5
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 hardness of an emerald is 7.5-8. The hardest stone is a diamond which has a hardness of 10.
Emeralds have a hardness of around 7.5-8 on the Mohs scale, so minerals with a higher hardness like corundum (9) and diamond (10) can scratch emeralds. Minerals with a lower hardness, such as quartz (7) and feldspar (6), would not be able to scratch an emerald.
You can determine whether a ruby or an emerald is harder by using the Mohs scale of mineral hardness. Rubies have a hardness of 9 on the Mohs scale, making them harder than emeralds which have a hardness of 7.5 to 8.
Rubies have a hardness of 9 on the Mohs scale of mineral hardness, making them one of the hardest gemstones. This means that rubies are highly resistant to scratches and suitable for everyday wear in jewelry.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
Emerald has a hardness level of 7.5 to 8 on the Mohs scale. This makes it a relatively durable gemstone but still susceptible to scratches from harder materials. It is recommended to handle emeralds with care to prevent any damage.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
The Mohs scale is used to determine the relative hardness of minerals.
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
It's called the Ore