10.1" Full Focus HD Digital Microscope, 12 Million Pixels, 50-1600X Magnification, Adjustable LEDs, Wireless Remote Control, Support PC Connection

SKU: GW45.0062

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Hello, thank you for your question. Yes, this microscope is suitable for observing both gemstones and coins. 
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Yes, it can indeed take photos and transfer them to your desktop in JPG format. 
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Compatible, Mac11.0 or higher. 
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Yes. The image remains clear as the magnification changes from large to small.