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These are in a limestone matrix with bright streaks of opal fillings cracks
but that material really can't hold a candle to alexandrite
in industry Czochralski-pulled cobalt spinel can be grown to ultra high purities and used in lasers as a Q switch
5x24x24mm and weighs in at 76g and has bubbles on one edge which can be removed in preforming
Pure Nd:YAG Calibrated Gems, Violet Laser Garnet Loose Stones high dispersion These are in a limestoneThese are violet Nd laser garnets (Nd: YAG) cut into various calibrated shapes: rounds, hexagons, and squares. These are violet in normal light and turn pure colorless under fluorescent illumination (like a CFL bulb). It also shifts from violet to magenta to blueberry purple depending on the color temperature of LED lighting, though this is less pronounced. For fancy designs and fantasy cut Nd: YAG stones, click here! Note that the smaller squares can
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