Kyanite

Pure kyanite is colorless in itself, but due to an interaction between iron and titanium, we see kyanite as the color blue. Another unique aspect is the double hardness. Almost all gemstones have only one hardness, whichever side you test from. But kyanite is harder in width than in length. Mind-blowing, right?

On the Mohs scale, it can score between 5.5 and 7 (depending on which side you're testing from). Kyanite stands out for its beautiful shine and its built-up structure.

Spiritually, the stone represents strength, new insights and can help you find the right course.

Kyanite belongs to the constellations Gemini, Libra, Sagittarius and Capricorn. Read more about which gemstones belong to zodiac signs here!