Benitoite is an unusual mineral found only in the southern part of the Mount Diablo range near the San Benito-Fresno border in California. Because of its similarity in color, it was initially thought to be sapphire. Benitoite is unique in that it crystallizes in a class of the hexagonal system which has a trigonal axis of symmetry. Large stones are unheard of and this stone is not only rare, but also quite attractive. Prices for 1ct. stones could easily exceed prices for almost any diamonds in a similar weight range.