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With magnification, one surface-reaching "feather" in the stone showed low relief over most of its extent, with extremely subtle yellow and purple flash colors. However, a portion of this fracture near the surface of the stone had very high relief, with no evidence of filling material. Transparent droplets were visible on the surface of the diamond near this apparently "unfilled" portion of the feather. The use of energy-dispersive X-ray fluorescence (EDXRF) spectroscopy confirmed the presence of lead (Pb) in this stone, which we have found in all effective diamond-filling materials that we have tested to date. In fact, we would not expect EDXRF to detect Pb in a gem diamond of this appearance unless some sort of filler was present. |
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