Need your advice

[Mioewo]

Where can you get a certificate that a gem is genuine?

[falyx]

If you need to check a stone for authenticity as quickly as possible, I advise you to contact a laboratory that specializes in evaluating gemstones https://gemscience.net/services-and-reports/grading-reports/ - here you can get a certificate of the quality of the stone if you you need to sell it.

[Cerber]

Thank you, we will know

[luckyjack]

was useful to know, thanks