How do i know in which specific EGL lab a diamond was certified?

When buying a diamond, whom should my certificate be from?

What is worse for a "colorless" diamond - Yellow or Brown hues?

Can a certificate state the price of a diamond?

I just bought a vintage diamond ring from the 1940s, and it came with a GIA diamond grading report. Is this possible? I thought the GIA didn't started issuing grading reports until much later.

Is a diamond grading report still valid after a diamond is recut and set into jewelry?

I would like to have my diamond engagement ring evaluated and certified. Where do I send it?

Does vintage diamond jewelry ever have diamond grading reports? @#191@#

My dog ate my diamond certificate, but my diamond supposedly has a laser inscribed number on it. Can I just get a replacement diamond certificate?

Can I just show up at the GIA with a diamond to be graded for certification, or do they only grade diamonds from big diamond traders and diamond wholesalers?