Color zoning in Fancy red and Fancy Vivid yellowish green synthetic diamonds

Color zoning in Fancy red and Fancy Vivid yellowish green synthetic diamonds

Figure 4. Under polarized light, the Fancy Vivid yellowish green synthetic diamond (left) displays patchy yellow color zoning caused by isolated nitrogen and a green color concentration on the culet caused by post-growth artificial irradiation treatment. The Fancy red sample (right) shows yellow to near-colorless zones following the cubic growth sectors, with the red color caused by post-growth annealing. Photomicrographs by Yixin (Jessie) Zhou; fields of view 7.19 mm (left) and 4.79 mm (right).

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