Stones must be cut properly to highlight the more attractive blue and violet hues, and deemphasize the undesirable brown tones.

December’s birthstones offer three ways to fight the winter blues: tanzanite, zircon and turquoise – all of them, appropriately, best known for beautiful shades of blue.

These gems range from the oldest on earth (zircon), to one of the first mined and used in jewelry (turquoise), to one of the most recently discovered (tanzanite).

Individual guides for each of these industries list resources available from trade associations, industry publications, research firms, and other sources which address subjects such as industry analysis, trends, statistics, and forecasts, financial statements and financial ratios, compensation and salary surveys, and business valuation resources.

Individual industries are listed below by industry category and Standard Industrial Classification (SIC) code.

Tanzanite measures 6.5 to 7 on the Mohs scale of hardness – which is not nearly as hard as the sapphire it often substitutes.

Given its vulnerability to scratch during daily wear and abrasion, tanzanite is better suited for earrings and pendants than rings.Classes are geared toward every demographic, catering to those who are single, married, or anywhere in between.With curriculum designed by Best Selling authors and highly acclaimed personal development groups, these workshops can generate results that impact every aspect of a participant’s life.Between its deep blue color and its limited supply, tanzanite is treasured by many – whether one is born in December or not!Unlike many well-known gems that have been in use for centuries, tanzanite’s history is relatively modern.Want dates, times and locations for any of the classes listed below?