Iolite falls at 7 to 7.5 on the Mohs hardness scale, but given that it has distinct cleavage in one direction, its toughness is only fair. This makes iolite vulnerable to breakage when set in a ring or other setting exposed to rough daily wear. Unlike tanzanite, iolite is rarely treated.

Does iolite scratch easily?

Can Iolite Jewelry Scratch? As a relatively 'hard' stone based on Moh's scale of mineral hardness, jewelry with Iolite is unlikely to scratch – so you can easily wear it with other pieces and store it safely in a Jewelry Box.

Is iolite durable?

Iolite is very affordable and durable, and can be used as a substitute for more expensive blue gemstones such as Sapphire. It is named from the Greek "violet", alluding to the purplish tinge often exhibited by this gemstone.