The reflection-loss-corrected visible spectra were used to quantitatively calculate the material’s color at a wide range of path lengths and under different lighting conditions. Blue Garnet Color Change 6.5x5mm Rectangular Cushion Matched Pair 2.03ctw, Blue Garnet Color Change 7.5x6.4mm Rectangular Cushion 2.30ct, Masasi Blue Color Change Garnet 1.75ct 11x5.5mm Marquise, Garnet Color Change Rectangular Cushion Matched Pair 1.00ctw, Blue Garnet Color Change 6x3.5mm Emerald Cut Matched Pair 1.18ctw, Blue Garnet Color Change 11.12x8.95x6.5mm Oval 5.96ct, Blue Garnet Color Change 9.46x7.46x5.94mm Oval 3.55ct, Blue Garnet Color Change 9x7mm Oval Portuguese Cut 2.25ct, Blue Garnet Color Change 9.87x8.36mm Oval 4.85ct, Blue Garnet Color Change 9.63x8.61x5.94mm Oval Mixed Step Cut 4.23ct, Blue Garnet Color Change Oval Matched Pair .75ctw, Blue Garnet Color Change 6.5x3.5mm Rectangle Matched Pair 1.56ctw, Blue Garnet Color Change 9.96x7.59x5.41mm Oval 3.57ct, Blue Garnet Color Change 10.38x8.57mm Oval 4.06ct, Blue Garnet Color Change 10.45x8.64mm Oval Mixed Step Cut 4.49ct, Blue Garnet Color Change 5mm Square Cushion Matched Pair 1.59ctw, Blue Garnet Color Change 6x5mm Rectangular Cushion Matched Pair 1.68ctw, Blue Garnet Color Change 7x4mm Emerald Cut Matched Pair 1.62ctw, Blue Garnet Color Change 9.67x7.92x6.04mm Oval 4.16ct, Blue Garnet Color Change 10.72x8.37mm Oval 4.66ct, Blue Garnet Color Change Rectangular Cushion Matched Pair 1.85ctw, Blue Garnet Color Change Rectangular Cushion 1.25ct, Blue Garnet Color Change Rectangular Cushion Matched Pair 1.05ctw, Blue Garnet Color Change 6x4mm Rectangular Cushion Matched Pair 1.64ctw. To understand why the garnets stayed essentially blue in the lighting conditions tested, we can examine the visible absorption spectra. The two garnets were also photographed under incandescent light (equivalent to CIE A) and fluorescent light (equivalent to CIE D65) for comparison. Eight garnet species are defined and methods of identification are described. Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis. 3. The garnets were predominantly composed of equal amounts of pyrope and spessartine. + more. A unique type of blue-green garnet has entered the market through New Era Gems (Grass Valley, California). 205–218), the material represented by these two garnets is pyrope-spessartine. Only reported in 2017, Blue Garnet is a rare and unusual sub-variety of an already rare Garnet, and despite its beauty, will always have an inadequate supply, making Blue Garnet highly collectable and very exclusive. Like us on Facebook. From project guides to how-to videos, we have everything you need to start creating. 258–259). Absorption bands at 410, 422, and 430 nm are caused by Mn. To the authors’ knowledge, gem-quality garnet with this chemical composition has never been reported.
Figure 3 shows the possible color exhibited by two representative garnets with different path lengths (defined by the stone’s thickness) and the approximate corresponding carat weight of a well-proportioned round brilliant; for details of this calculation, see Sun et al. Unlike traditional blue-green garnets that exhibit a color change from purplish or orange red in incandescent light to bluish or yellowish green in daylight, these essentially remained blue in the lighting conditions we tested (CIE standard illuminants D65, A, F10, and F9, and a cool LED light with a 7500K color temperature). As the concentration of vanadium increases, the red transmission window is preferentially closed and the color in both incandescent and daylight illumination is determined solely by the blue-green transmission window A. The 0.288 ct faceted stone measures 4.14 × 3.20 × 2.66 mm, while the 0.221 ct stone below it measures 4.01 × 3.09 × 2.10 mm.
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