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Calvin's Jewelry has a Certified Gemologist from the American Gem Society on staff. To maintain the educational standards of membership, the Society requires titleholders to update their gemological and jewelry knowledge by passing an annual Recertification Exam. This title ensures that you are doing business with a knowledgeable and ethical businessperson.

In order to maintain membership, jewelers in the American Gem Society agree to:
  • Provide full disclosure of the products they sell.
  • Never intentionally deceive employees, consumers, vendors, or business partners.
  • Compete fairly and never speak unprofessionally about competitors
  • Resolve any customer complaints relating to the sale of a product.
  • Not sell conflict diamonds. AGS jewelers must make every effort to fully comply with the Kimberley Process Certification Scheme and the World Diamond Council System of Warranties.
  • Continue their gemological and jewelry education, always improving knowledge and trends.
  • Adhere to anti-money laundering (AML) program, designed to comply with the USA Patriot Act.
Under the guidelines for "Social and Human Rights Practices", AGS jewelers are required to respect the fundamental human rights of all their employees, business partners, and, of course, their customers. They must adhere to all applicable laws related to work hours and compensation and they must conduct business in an environmentally responsible manner.

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Certified Gemologist, CG
A Certified Gemologist has taken advanced studies in diamonds and colored gemstones. A CG also demonstrates mastery of diamond, gemstone, and precious metal testing procedures.

Established in 1931, the Gemological Institute of America is the world's foremost authority on diamonds, colored stones, and pearls. GIA exists to protect all purchasers of gemstones, by providing the education, laboratory services, research, and instruments needed to accurately and objectively determine gemstone quality.