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Show Mgkl Dlaeolora Oama, Th discoloration of precious stones whru they huve been exposed to th air for a long time is well known. Emeralds, Emer-alds, rubles and sapphires aro less susceptible sus-ceptible to atmospheric Intlrjnce, but even they, suys the Tutler, ao not exempt ex-empt from change. If two rubles of the same size and shade are kept for, say, two years, one In a showcase aud the other In absolute darkness, aa examination ex-amination of the stones at the end of that time will Invariably show thnt the showcase ruby has become distinctly lighter iu color. The most sennlUvo of all stones to variations in light 1 ths opul. This stono draws Its marvelous mar-velous rulnbow reflection from numerous nu-merous little clefts, which allow tha light to puss and reflect It In dlfforert directions. Often the opul stunds th manipulation of cutting and polishing well, and all ot a sudden It splits. |