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Amethyst and citrine are actually two types of quartz. In both cases, the Silicon dioxide crystal lattice of the rock crystal contains impurities of iron, which impart the color to the stone. Amethyst, of course, is purplish, while Citrine is generally, yellow, or brownish. Ametrine is a single rock
crystal containing zones colored as both amethyst, and citrine.
Commercial citrine jewelery is often produced by heat-treating amethyst. The heat causes the iron to form different bonds, and the stone changes from a purple color to a yellow-brown color. Ametrine is also currently being produced through differential heat treatment, but generally, the result has the amethyst coloration on one side, and the citrine coloration on the other.
Now gemstones are generally intended to be very personal gifts. Therefore, I propose that we use sets of converging lasers to heat specific portions of the original amethyst crystal, thereby making it possible to monogram a gem in three dimensions.
purple and yellowish gemstone. [ye_river_xiv, Jan 04 2012]
||Storage, yes, but retrieval?
||Aaaaaach, always with the petty details already !