Show real diamonds are cold to touch electrify if rubbed the war has created a greater demand than ever for dia diamonds m ands with a little care a genuine stone tan can be distin distinguished distinguish guis lied from an imitation by its touch A real stone will always feel cold whereas where a s an imitation one feels warm if a diamond is rubbed with a cloth until it has been warmed by friction it becomes charged with positive electricity an imitation stone will lota tourmaline or a topaz if treated in the same way also becomes charged with positive electricity tri city while amber becomes negatively charged diamonds are of four distinct colors the most valuable absolutely colorless are gem stones and are known as white diamonds the second grade has a distinct bluish tinge the third yellow and the fourth brown |