Many labs have identifying software - so they know if they graded the stone previously. As such they also know the gradings.
GIA has proprietary software that does this. There is other software for labs to do this too.
Now if the stone is submitted a second time and they knew the previous grading, how many labs would actually change it?
In the past ( before gradings reports became a "requisite" by consumers) a lot of retailers would say that " You don''t need a lab report"..... if you send the stone back again, it could get a different grading. This DID happen before labs put in the software to know if they graded the stone before.
While the current trend to making a guarantee seems very "lionhearted" like..... in most cases I see it as a "toothless tiger".
The only evidence I''ve "seen" is GCAL''s video of where they state they have an escrow fund from which they pay these sort of claims. The claim to have paid out funds in some instances, but the details of such incidents isn''t reported.
Rockdoc
GIA has proprietary software that does this. There is other software for labs to do this too.
Now if the stone is submitted a second time and they knew the previous grading, how many labs would actually change it?
In the past ( before gradings reports became a "requisite" by consumers) a lot of retailers would say that " You don''t need a lab report"..... if you send the stone back again, it could get a different grading. This DID happen before labs put in the software to know if they graded the stone before.
While the current trend to making a guarantee seems very "lionhearted" like..... in most cases I see it as a "toothless tiger".
The only evidence I''ve "seen" is GCAL''s video of where they state they have an escrow fund from which they pay these sort of claims. The claim to have paid out funds in some instances, but the details of such incidents isn''t reported.
Rockdoc