Show tests of D amends mot persons are obliged in the purchase of a diamond to rely am upon the word of the man who sells the stone while many years oi observation and experience are needed become an expert with respect the val ie and purity of diamonds yet there are certain extremely sim pie tests capable of being made by the most inexperienced one is by means of a needle hole pricked a piece of ord nary cardboard looking through the stone tested at the cardboard one nil see two holes it the d amond be spurious only one if the gem be denune the rea on for this Is that an in citation diamond will give a double retraction the real stone but one refraction it is cla med that there asino acid having any perceptible effect upon a genuine diamond hydrofluoric acid will if dropped upon a stone made of glass corrode it but upon the fide stone it will have no effect at all harper s weekly |