GIA claims colourless to near colourless diamonds submitted primarily to GIA laboratory in Israel are potentially treated, says the GIA’s alert.
GIA says the treatment may be a process that temporarily masks the inherent colour by as much as three grades and can lead to a higher grade. GIA have not identified the treatment process yet. At this time, GIA claims the diamonds treated in this way have been submitted by just a few clients.
NOTE: the above example is and example report only
GIA has terminated submissions from the clients who have submitted these diamonds to GIA and have notified the trade bodies.