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By Ralf Tappert
Diamonds in Nature: A consultant to tough Diamonds illustrates the variety of crystal shapes, shades, floor textures, and mineral inclusions of tough, uncut, clearly forming diamonds. each one bankruptcy comprises pictures that express the original actual features of the diamonds, and the accompanying textual content describes the strategies that ended in their formation. This ebook is a useful reference handbook for pro geoscientists—including gemmologists and exploration geologists.
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Extra info for Diamonds in Nature: A Guide to Rough Diamonds
Colorless diamonds with rough surfaces, for example, may appear whitish (Fig. 3-04). Many diamonds are compositionally zoned. This means that a single diamond can have zones with diﬀerent colors, transparencies, or color intensities. Compositional zoning is most apparent on diamonds with ﬁbrous overgrowths (Fig. 2-53). Colorless diamonds A large proportion of diamonds appear colorless at ﬁrst glance (Fig. 3-05), but it is common to ﬁnd that many of these colorless diamonds have faint hues (Fig.
The less protruding features, including the crystal faces, are aﬀected as resorption progresses (Fig. 2-07, Fig. 2-08, Fig. 2-09). Resorption continues until entire octahedral crystal faces disappear. The complete loss of octahedral crystal faces results in a rounded dodecahedral habit (Fig. 2-10). The transition from an octahedral to a dodecahedral habit is associated with a considerable loss of the diamond’s original volume (Fig. 2-11). 96 ct). Numerous triangular etch pits (trigons) indicate that the octahedral crystal faces were also affected by the resorption.
The ideal dodecahedron consists of twelve equally-sized rhombic faces (Fig. 2-02). In contrast to this ideal geometry, the faces of dodecahedral diamonds are always convex, which causes the diamonds to appear rounded. 214 Some dodecahedral diamonds are spherical, but many are ﬂattened, elongated, or distorted in other ways. The crystal surfaces commonly exhibit an additional straight or undulating ridge that connects their shortest diagonals (Fig. 2-20). In most cases, this ridge is a minor feature, but occasionally it is quite prominent.
Diamonds in Nature: A Guide to Rough Diamonds by Ralf Tappert