by voce » Feb 11, 2019 I know that benitoite and kornerupine are different minerals. They are both around 6-6.5 on the Mohs scale. They both can range from transparent to a saturated blue, and in the case of kornerupine, green. I know that these minerals are rare, benitoite rarer than kornerupine. The question I have is: why are these gemstones used in jewelry? They don't look (at least to me) to provide a unique tone of color, and neither is as dispersive or gorgeous as sphene, in my humble opinion. Yes, they are rare, but why wouldn't you want to have sapphire instead, which can match the color/crystal and be more durable? Perhaps I haven't seen the finest examples of kornerupine and benitoite? What makes people take a look at them and think they must have them set in jewelry instead of leaving them in a collector's little gem box? Please educate me!