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GIA certified gemologists Three certification levels Extra discount for multiple orders Save with "no certificate" option for fakes

CGS changed hands in April 2014. Thank you to our clients! This web site is currently under redevelopment and CGS will reopen in 2015.

About Us

Colorado Gem Services LLC aims to provide reliable independent colored gem reports at an unbeatable price. Our unique business model frees CGS gemologists from time-consuming paperwork, enabling them to analyze more stones.  That means bulk savings, which we pass on to our clients. 

Every gem entrusted to us is examined in the USA by a highly trained and accredited professional gemologist using traditional gemological equipment and advanced scientific analysis such as FTIR, ED-XRF and Raman spectroscopy.  We combine modern analytical techniques and extensive practical skills to interpret gemstone characteristics. No students. No shortcuts.  No conflicts of interest – we’re not gem dealers.

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    We think colored stones rock

    Puns aside, most gemologists focus on diamonds and not too many have specialized knowledge of colored stones. Our team brings together a wealth of experience in this fascinating field.

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    More bang for your buck

    We’re proud to provide basic certification with more detail than most for a lot less. If you need advanced scientific testing, you’ll find our prices hard to beat.

  • Your stone is safe with us

    We’ve all heard the horror stories about dubious Asian vendor/labs swapping out stones.  Just another reason to have your gemstones certified right here in the USA.