[Jewelry making - Article 00702] - Re: [Orchid] Pink Sapphire or Pale Ruby?

[leonid surpin]

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>     all my sources seem to indicate that corundum, sapphire, and ruby
>     all share the same SG 3.99I only have very old books. What is the
>     difference 

    Actually it is slightly higher, but your point is right on. Even if
    there is some difference between ruby and sapphire, it is useless for
    practical application. Determination of SG requires very
    sophisticated equipment and procedures. Otherwise results are not
    trustworthy. The precision obtained on run of the mill equipment is
    not good enough. 

    Stones would give different results depends on the inclusions they
    contained as well. At best SG may be used as an indication but in no
    way is conclusive. 

Leonid Surpin.
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