The black jade, charming stone that wants to ascend on the diamonds throne.
Roberto Coin has chosen it for his collection Black Jade: this stone could have a wide diffusion, assuming that if you find a sufficient quantity. To propose this valuable material is now Kings Stone US, a New York company that owns the rights of import to the US. To guarantee the quality and the characteristics of this stone are the National Gemstone Testing Center (NGTC), Chinese institution with the official license, and two American organizations, the American Gemological Laboratories (Agl) and the International Gemological Institute (IGI). The black jade which is proposed, however, does not come from China, but from a mine in South Africa of owned by King Stone, even though the certification of authenticity is the prerogative of NGTC, the leading authority on the subject.
The characteristics presented for this stone (it is jadeite, not nephritis) are relevant: is shining like a diamond and has a hardness of 7.5 to 8.5 on the Mohs scale, more or less so as an emerald or topaz (the Diamond is 10 ranked). In addition, according to King Stone, jade is an alternative to the “blacks treated diamonds”, since it is a stone from the natural color, glossy, and consistent as a precious stone. The effect is fascinating, as evidenced by the collection of Roberto Coin.
