Tanzanite Reports to Include ‘Four Cs’

The International Gemological Institute will help launch the Tanzanite Foundation's tanzanite grading report, two years after the foundation introduced its quality-grading scale. The Tanzanite Foundation was created by TanzaniteOne, the mining company responsible for the largest portion of the Merelani Hills tanzanite deposit in Tanzania. The report includes the traditional “four Cs” but grades colors using one of two color-grading scales. The first scale is bluish-violet (more violet than blue); the second is violetish-blue (more blue than violet). Both scales are divided into six saturations, ranging from exceptional to pale. The clarity scale consists of four grade ranges, from eye clean to heavily included. Cut is graded in four categories, from excellent to fair. Tanzanite grading reports issued by IGI also will provide country-of-origin authentication. At present, tanzani

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