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Mohs scale: Tanzanite's hardness and what does it mean

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A German gemologist and mineralogist, Friedrich Mohs introduced an instrument designed to rate gems on a scale of 1-10. The rating is determined by the measure of scratch resistance against other minerals. Diamonds top the charts at 10 on the Mohs hardness scale, while Talc rates the lowest at 1; tanzanite is rated between 6.5 and 7. 

Cleaning and care

Jewelry should be cleaned periodically .Tanzanite should not be exposed to hydrochloric and hydrofluoric acids as they tend to damage the stone. The best way to maintain tanzanite jewelry is to clean it with a little soap and warm water. Steam cleaning or ultrasonic cleaning methods expose the gemstone to high heat and frequency vibrations that can, again adversely affect the cleavage of the gemstone.

Oval Tanzanite Ring

Read more about caring for your tanzanite jewelry in our detailed blog.

A great example of keeping the gemstone protected, in regard to jewelry, can be seen in our Purvi tanzanite bracelet that has the gem beautifully enclosed in a bezel setting. The case-like design offers some protection for the gemstone from some abrasion, while fastening it securely to the metal. 

Purvi Tanzanite Bracelet
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The gemstone does have a fair resistance to breakage, but is prone to scratches, hence, it’s recommended it be worn on special occasions. Of course, when you have luxurious designs like our 8.85 CT tanzanite earrings, in 14-carat white gold, it’s an easy decision. The timeless design, featuring diamonds surrounding the violetish-blue gemstone, emphasizes the beauty of each earring and makes them quite the eye-catchers. 

Oval Tanzanite Earring


Tanzanite is Trichroic, post heating - showcases three different colors, deep royal blue, bluish-purple, and a slight reddish shade. This means, according to the Mohs scale, tanzanite is not affected at permissible temperatures. However, the gemstone could break on surpassing them as it possesses a single cleavage, making the gemstone prone to abrasions.

Differentiating properties
Inclusions are minerals that are crystalized while the gemstone is being formed. These minerals add to the gemstone’s strength. One can easily spot these attributes in this fantastic 1.74 CT oval tanzanite ring from our collection. 

Oval Tanzanite Ring

Lesser known fact - Though the Mohs scale is used as a yardstick to determine the strength of a gemstone, the score of each individual gem is subject to change, based on mineral inclusions that form, as part of the formation process. 

Top Tanzanite has carved a major niche in the industry over the last 42 years. Our world-class artisans meticulously put together every tanzanite jewelry design to be enthralling so we can offer you authentic gemstones and tantalizing designs as well as loose tanzanite gemstones.

Visit our website for our full range and follow us on social media for updates and offers to buy tanzanite jewelry for sale.

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