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CGC Certified Gemstone Consultant VIP Practice Exam

CGC — The Certified Gemstone Consultant (CGC) credential is offered by the International Colored Gemstone Association (ICA) and related gemological education bodies; it tests professional-level knowledge of colored gemstone identification, grading, treatments, trade practices, and gemological instrumentation — this is an original practice set modeled on the knowledge domains assessed by GIA, ICA, and Gem-A equivalent credentialing programs.

29
Questions
90m
Time Limit
75.00%
To Pass
Question 1 of 29👑 VIP

A client brings in a vivid blue oval stone she purchased in Colombo. Under the refractometer you obtain a uniaxial reading with refractive indices of 1.762 and 1.770. The stone fluoresces an orange-red under long-wave UV. Which gemstone is MOST consistent with these readings? A) Blue spinel B) Blue sapphire C) Blue tourmaline (indicolite) D) Tanzanite

Questions 2–29 and full explanations are VIP-exclusive.