Saturday, May 25, 2024


The popularity of Tanzanite is growing steadily. AnchorCert customers have been asking for a simple but authoritative grading standard to help the consumer understand the variation in quality and price of this rare and precious stone.

The vivid colour and excellent clarity of top quality Tanzanite is particularly evident in larger stones and it is not unusual to see a Tanzanite of several carats, often in a stunning setting, enhanced by diamonds.

Tanzanite set jewellery is therefore likely to be expensive and, understandably, the consumer wants to know what they are buying and be sure it is the real thing.

Now, after months of research and investigation of other grading systems, AnchorCert Senior Gemmologist Anu Manchanda has developed a simple and straightforward grading system for Tanzanite.

AnchorCert is the only Laboratory in the UK to have its own grading system for this precious Gemstone. Under the system, stones are split into one of four colour classifications depending on the intensity of colour and regardless of whether they are violet or blue. The commonly used ‘A’ system has been applied with AnchorCert grades ranging from ‘A’ for Pale to ‘AAAA’ for Vivid.

Clarity grades are in line with GIA Coloured Stone grading, ranging from IF (Internally Flawless) to I3 (Included). Marion Wilson, Marketing Director at The Birmingham Assay Office, said: “We wanted a classification system which would be easy to understand. It’s no good offering jewellers a service which adds value if it’s too complicated to explain.

People are familiar with the terminology used by GIA and it made sense to classify Tanzanite using the same terms. The AnchorCert team has done extensive work to determine exactly where the boundaries should fall. For colour, it is the intensity which determines the rarity and value of the stone and this will be assessed against an AnchorCert set of Master Stones. The actual colour is obvious even to the inexperienced eye.”

The new service is supported by an A4 Characteristics ShowCard, which the Jeweller can display to explain the Tanzanite grading system to customers. Both loose and mounted Tanzanite stones can be graded and reports are provided on the popular credit card sized ‘Mini Report’. A mini leaflet helping to explain the AnchorCert Grading system will also accompany every item graded.

AnchorCert has already signed up several well-known jewellers that deal in Tanzanite and anticipates a high demand for its Tanzanite Grading Service.

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