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Gem identification

Optics: measuring and testing – Crystal or gem examination
Patent

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Gem viewing and manipulation apparatus

Optics: measuring and testing – Crystal or gem examination
Patent

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Gem viewing and manipulation apparatus

Optics: measuring and testing – Crystal or gem examination
Patent

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Gemstone evaluation system

Optics: measuring and testing – Crystal or gem examination
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Guides for color grading faceted gemstones

Optics: measuring and testing – Crystal or gem examination
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