Heading into the final weeks of the year, dealers are reporting mixed results. But most agree there were a number of bright spots in 2014. The global sales of gems and jewelry experienced solid growth this year, and conditions in the United States have improved significantly.Colored stones had a banner year, and prices for high-end extra fine natural gems ­certainly reflect that. This year witnessed a number of record per-carat prices achieved at auction in the category. This has only further stimulated demand and higher prices at all levels of the trade for fine color. The reality is that fine gems trading at that level are so scarce that even after reaching prices few thought were sustainable a year ago, they continue to move up. Such increases have been most noticeable at the high end but definitely are not limited to the top goods. The midlevel of the market also experienced good de