The Mohs hardness scale is a widely used method for determining the relative hardness of gemstones and minerals. Developed in 1812 by German geologist Friedrich Mohs, the scale is based on a simple principle: a material’s ability to scratch another material. The Mohs scale is especially useful in the field of gemology, as it provides valuable information on the durability and scratch resistance of various gemstones.
Mohs Scale Gemstone Rankings
The scale consists of ten minerals, arranged in increasing order of hardness, from softest to hardest. Starting with the softest, talc, the scale proceeds through gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum which includes sapphires, and finally to the hardest, diamond.
Each mineral on the scale can scratch any mineral ranked lower, but not those ranked higher. This means that a diamond, with a Mohs hardness of 10, can scratch any other mineral, while talc, with a hardness of one, can be scratched by all others.
In practical applications, gemologists and jewellers use the Mohs hardness scale for gemstones to determine the suitability of a particular gemstone for use in jewellery designs.
A gemstone with a hardness of 7 or higher is generally considered appropriate for everyday wear, as it is less likely to scratch or suffer damage from daily activities. This knowledge plays a crucial role in the selection, handling, and maintenance of gemstones in the jewellery industry and particularly when it comes to choosing stones for engagement rings.
Engagement rings are worn on a daily basis for many years. With that in mind, they need to be durable enough to withstand this yearly daily wear. Choosing a gemstone with a low Mohs ranking wouldn’t be a great choice because of the very likely damage to the stone because of its softness. Choosing a harder gemstone with a higher Mohs ranking would be an ideal choice to ensure the engagement ring stays in great condition for years to come.
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