Precious Stones To Order

Attempts have been made, not without sucuoss, t; fonn niinerals, says Prof. Crooker in the Forum. Artificial ultramarine hos long been an article of commcrco. Tiio formation of the diamond is said to h.-.vo bren actually effected, trat in the opinión of the inVentor the process is so difficult and so dangerous that the diamond miner and the diamond merchant need not fee] uneasy. The ruby and the sapphire have lately been reproduced in Paris, and curiously enough Wie coloring matter in both is found to be due to ono and the same metal - chromium - in different states of combination. Red and blue stones of an intermedíate violet form whloh might be liliened to the raro and beautiful oriental amethyst, have been obtained in one and the same operation f rom the same lot of material. The jevvels thus produced havo so far all been small; large enough to form the pivots of superior watch works, but not large enough to rank as rare and costly ornamental objeets.