[Jewelry making - Article 00402] - Re: [Orchid] Diamond developments

[Alden & Glenda Blood]

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    Hello Gerry:  I have been following your great posts with
    considerable interest.  Just read your post about diamond
    developments in the list received today (3-10-04).  A report has
    just come out in Science News, February 28, 2004, Vol. 165, No. 9
    about a recently developed type of synthetic CVD diamond that has
    yielded the hardest single-crystal diamond material ever tested,
    apparently considerably harder than natural diamond.  The material
    was so hard that tools used to measure hardness of very hard
    materials left no mark on several of the crystals tested.  The
    crystals are also very tough and fracture resistant.  The extra
    hardness was achieved by subjecting the original CVD product to
    temperature of 2,000 degrees Celsius at very high pressures. 
    Testing has shown that one or two types of natural diamonds also
    show big jumps in hardness when treated the same way.  Nothing was
    said about the size of the material tested.  It, no doubt, is a long
    way from being marketed as a new gem material.   A substance of
    greater strength than a diamond, much less of "equal strength of a
    diamond," may require thinking it over much earlier than you
    anticipated. Captain Blood "Marlinespike Seamanship in Precious
    Metals" mariner AT tgtel.com


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