The China building industry and geology investigation center-Shanxi unit undergoes two year investigation, recently discovered and verified one rare and precious black granite mine contains "dark blue diamond stone" in the Shanxi Province Ningshan county. Luster of dark bule diamond stone changes along with the illumination angle or the person angle of view. And the dark bule diamond stone has beautiful dynamic change-hidden and the light shade interaction. Its crystal gloss and the pattern image are similar to the starry sky where stars are glittering pale blue ray, therefore it named as "dark blue diamond stone". This ore physique is big, and because its crevasse is few, it can be called the best quality goods in the granite, by reputation name "the first stone of west China".