To: Bill Jackson who wrote (1265 ) 9/7/2003 9:18:20 AM From: E. Charters Read Replies (1) | Respond to of 16206 Landing fields for personal aircraft..? It pains me to tell you this.. have you ever wondered why the tops of buildings are flat? Doh!.. I will bet you have never been to the roof of a single building in air-car town or TO as it is affectionately known.. and seen the 100's of air-cars parked there. Did you ever stop to think of why the freeways are so uncrowded these days? On another topic we see that the motorized gyro skateboard is now all the rage and there is talk of making new city lanes for them. Winterizing is still being worked on, but they will save so much parking space in the city and cut traffic so much more, that it is safe to say that that problem, now on the fast track will be licked in no time. 10 cent diamonds in cereal boxes? It is still cheaper to mine them. IMHO, AISBY (in my humble opinion and it should be yours) Artificial gems have been out for ten years. Almost raised money for a gem maker from the states who used to work for GE. He wanted 1500 and it took one week for a human carbon based diamond. The idea was to make it a cermonial get away in Aspen and have the diamond made with a skin cell seed. That was back in 1996. This market has never worried DeBeers, who have weathed the cubic zirconia scare and many others. The maker of these stones just seem to keep having financial trouble, and then they fade from sight. Many are on the FBI's missing persons list. The ID of artificial stones grown by layering does not require a lab. Pro gemologists say they can tell at a glance. Perhaps for final judgement they can use the laser refractometers that some jewelers have. The crystal structure of these stones are subtly different and they also exhibit different interference figures under a bertrand lens with the petrological microscope. The center of the crystal also has an opaque seed, such as platinum and this shows up with cursory examination under a 20 power lens. Finally the mode of growing them leaves them layered like an onion, and these boundaries serve to refract light at each layer, cutting down the light capture of the stone. These lines can be detected making the stone obvious to the trained eye. Dodecahedral diamonds, called Lonsdaleite were first recognized coming from meteorites and were thought to be impact related. They were the first crystal structure of diamond-like substances made, and were later found naturally in mines in the 1950's. Note I say diamond like, as the US industrial diamonds made by GE since 1950 are actually not diamonds at all, but "borazon nitride". They are not purely carbon based. EC<:-}