Request a light-performance report

Grading a stone of your own? The free viewer on the Compare page gives you our grade score, the studio, spotlight and worn views, and the hearts-and-arrows pattern. The full report adds the pictures we do not compute in your browser: the light return map and the flash map, rendered on our own equipment in Singapore from the proportions on your certificate, with a short written assessment.

It is free. Use the form below. In the message, give the report number (for example LG734527302) and copy the proportions printed on the report: table %, total depth %, crown angle and pavilion angle, plus star and lower-half lengths if the report shows them. Those four numbers are all the simulation uses. We do not look reports up with the laboratory and never contact it on your behalf. We send the report by email, normally within two working days, Singapore time.

Every picture in the report is a simulation from certificate proportions, not a photograph of your stone. It does not account for facet variations and does not show clarity or inclusions.