Abstract
By means of X-ray topography and cathodeluminescence tomography, three brilliant cut diamonds were investigated. It was demonstrated that the growth of Major part of two brilliants cut from the same rough took place on a seed diamond cuboid formed eleswhere and transported to the growth site. From the Morphological characteristics of the seed, it was argued that the seed was formed in high pressure metamorphic rocks in the subduction zone, and transported into an ultraiafic magma in the Mantle.
