4. Abrading
  5. Abrading process
  6. Glass or stone abrading

Wetenschappelijk en Technisch Onderzoekscentrum Voor Diamant

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Method and apparatus for bruting precious or semi-precious stone

Stone working – Precious stone working
Patent

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Method and device for polishing gemstones

Abrading – Abrading process – Glass or stone abrading
Patent

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Method for discerning colorless and near colorless diamonds...

Optics: measuring and testing – Crystal or gem examination
Reexamination Certificate

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