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GIA Explains the 4Cs
GIA 4Cs Interactive Sliders
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GIA Graded Mined Diamonds
Largest Selection Of Top Quality Diamonds
Use the individual sliders from the Gemological Institute of America (GIA) to compare diamond grades and carat weights. Choose a category below, then move the on-screen slider within the tool to explore it.
These tools are provided by GIA and use American English, so you may see “color” rather than the UK spelling “colour”. GIA created the 4Cs framework used throughout the diamond industry. At John Macintyre & Son, we specialise in GIA graded mined diamonds.
Choose a category to explore
For the best experience, turn your phone sideways or open the tool full screen.
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Explore GIA’s complete introduction to the 4Cs, or learn how mined and lab-grown diamonds are formed, identified and graded.
Last reviewed: October 2026 · Interactive tools courtesy of GIA®.
