Heinz-Jürgen Bernhardt und Karl Schmetzer Person-Info 

( Ich bin Heinz-Jürgen Bernhardt)
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Fall Gems & Gemology Features Coloured Gemstones and ...www.diamondworld.net › News

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· The fourth article, by Dr. Karl Schmetzer, Prof. H. Albert Gilg and Dr. Heinz-Jürgen Bernhardt, is “Synthetic Star Sapphires and Rubies Produced ...
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