Your liability is only to the original purchasers, and any
secondary purchaser could be sued for slander if they spread
roomers about your reputation (a legal process usually not worth
the time and money to pursue.)
I was just asked by a local car dealer to check a diamond
pendant he took in trade on a car. The customer had given him an
appraisal by a local store with the pendant. The only
similarities between the description on the appraisal and the
pendant was they were both 6 prongs and yellow gold. The diamond
in the pendant was.75mm smaller, several grades darker, and I2,
not VS2. The car dealer’s first question was if I thought the
jeweler had switched diamonds. It never occurred to him that his
customer might have substituted another complete pendant.
If you wear cubic zirconia, God will know.
Minutes off I-95 in sunny central SC, USA,
where the camellias are blooming.