Diamond Cheating Methods
Converting colors in diamonds – diamonds are attracted to fats so when you dip inglass of tea it sticks to diamond and becomes a black diamond then wash it off
Mixing diamonds, natural lab-grown or Moissanite from an undisclosed sourcebecause no certification is needed for small diamonds under .3 carat, so there is noregulation
Replacing your diamond that you bring to check or "selling" you one piece andquickly swapping it. Know your stone, pay attention to them
Creating diamonds that have the crown as real and the pavilion is fake, when theyput it in a ring the gemologist only sees the real on top.
Writing in the belt/girdle that it is a very good diamond and the GIA has to statewhat it says so people get confused and think it’s a very good diamond
India – Someone can buy empty GIA certificate templates and fill them in himselfhow he wants, not stating that its lab-grown or natural
Caribbean – Send the same diamond in to get several certificates and then replacethe stone. Certificates say it's very good even if fake.