When buying alexandrite jewelry, the most critical factor is distinguishing between natural and lab-created stones, as natural alexandrite is exceptionally rare and can cost significantly more than diamonds. A "good report" for a natural stone is an independent laboratory report from a reputable authority like the Gemological Institute of America (GIA) or American Gemological Laboratories (AGL) to confirm its authenticity and geographic origin. Key Buying Considerations Natural Alexandrite Stone - GIA