Clarity and/or color are enhanced by heat. The applied type of enhancement for the ruby or sapphire under consideration is, according to the opinion of GemResearch), considered a permanent enhancement. Extremely small residues of glass-like materials present in cavities or as isolated, extremely small residues in fissures affecting the weight of the gemstone less than approximately 0.001 carat, such as present in the ruby or sapphire under consideration are, according to the opinion of GRS GemResearch Swisslab, permanent enhancements. Enhancements such as Type A are considered permanent and will always be mentioned on the front page of the report.