What is the difference between a grading report and an appraisal?
A grading report or identification report are entirely about the gemological information of the stone. They do not attach a value, or indicate ownership of the stone. An appraisal evaluates the stone, and determines the value. Often the two are used in conjunction, since grading reports are used to determine the quality of the stone, while the appraisal translates that quality into value. This is especially useful when buying or selling a loose stone.