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Diamond/Gem Fan Gauge 4/7 Arms

G.T.W 470

The Diamond/Gem Fan Gauge (4/7 Blade) is a precision measuring tool used by jewelers and gemologists to accurately estimate and compare the size (diameter) of diamonds and other gemstones. Crafted with precision and ease of use in mind, this fan-style gauge features four or seven individual blades, each marked with standard carat sizes or millimeter measurements.

  • 4/7 precision blades: Each blade represents a standard gemstone size, typically ranging from small to large

  • Durable construction: Made from stainless steel or plated metal for long-lasting use and resistance to tarnish.

  • Fanned design: Blades are riveted together and can be easily spread out or folded back for compact storage.

  • Clearly marked sizes: Each blade is engraved or stamped with size indicators, ensuring quick reference.

  • Ideal for: Jewelers, gemologists, appraisers, and anyone working with loose or mounted stones.

G.T.W 470 - A 4 Arms
G.T.W 470 - B 7 Arms