IGI LABORATORY-GRADING

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Washington Diamonds are graded by the International Gemological Institute, the highest standard for diamond grading.

IGI Certificates

IGI Laboratory Grading

Washington Diamonds are graded by the International Gemological Institute (IGI), the world’s largest independent laboratory for grading and evaluating diamonds and fine jewelry. Following thorough scientific analysis of a diamond by a team of gemologists using state-of-the-art equipment, IGI provides a detailed report attesting to the crucial characteristics of the diamond – its 4Cs: carat weight, color, clarity and cut.