Prices for fine natural colored gems have achieved incredible growth during the past few years. In the U.S. market, the one area that shows some weakness is calibrated goods. This category, which had been strong for some time, slowed as manufacturing moved out of the United States to overseas markets.Of the big three, emerald is particularly well positioned at the moment and has been for a few years now. Despite a significant increase in prices for fine Colombian emeralds, the gains haven’t been as dramatic as for certain other gems. Therefore, prices for fine emeralds still have room to climb. Keep in mind, however, that stones with moderate or greater levels of enhancement have not seen the price increases observed for natural and slightly enhanced material.Prices of very fine Burma (Mogok) ruby remain strong with supply extremely tight for sizes above 2 cts., and the trend will like