How can I tell if a diamond is real?
user
Try shining a strong light through it and see if there are any imperfections in the light.  That would mean it’s an artificial diamond.
assistant
What do imperfections in a diamond look like?
user
They look like lines.  Diamond is composed of tiny crystals.  If the tiny crystals are oriented in a pattern, like a line, the diamond will not be very valuable.
assistant
How can I tell if a diamond is real?
user
Try shining a strong light through it and see if there are any imperfections in the light.  That would mean it’s an artificial diamond.
assistant
What do imperfections in a diamond look like?
user
You can’t tell with just one diamond, but the most common are tiny bubbles of air trapped inside the crystal.  Most people wouldn’t be able to see this with just a naked eye, but a microscope would easily show it.
assistant
How can I tell if a diamond is real?