Lab Certificates and Grading ReportsA lab certificate or grading report documents information about an unmounted gemstone. Grading reports differ for diamonds and colored gems, but documentation for each type includes specifics about carat weight and dimensions, color and clarity grades, and items relating to the gemstone's cut and shape.
Think of a grading report as kind of a road-map of the gemstone -- the map will not change unless the gem undergoes alterations or an error was made during evaluation.
Jewelry AppraisalsA jewelry appraisal can be ordered for any item of jewelry, no matter what its composition. Gemstones can be either mounted or unmounted -- the jewelry being appraised needn't contain gemstones.
Jewelry appraisals put a dollar value on the jewelry being appraised, and are often performed for insurance purposes. An appraisal might also be necessary to settle an estate or a to divide property during divorce. Or you might just want to verify an item's true market value before you commit to a purchase.
Market values change, so most professionals recommend you have fine jewelry appraised every two years. Ask your insurance agent for a recommendation. If you use the same appraiser, it is often possible to receive an update, which is usually less costly than a brand new appraisal.