So hard to tell from photographs. They look like they have the characteristics of those crystals, but only an expert examining them first hand would be able to tell you for sure, based on the temperature, weight, facets etc.

Unfortunately there are fakes out there.

Fortunately there are experts around who can help to identify things or tell you if they're fake. Look for a specialist local to yourself.

I would say the 'Smoky Citrine' has been irradiated and so has been enhanced.
The Obsidian looks like black glass, but then of course that is what it actually is, but has that been produced by a volcano? I doubt it, have a really close look and see if there are tiny bubbles or impurities.

Hi,
I have received a few crystals and would like to know if anyone can identify them if fake.

2 of them are obsidian and 1 is smoky citrine.

I meant to ask what do you mean by fake? May seem a stupid question but did you mean altered or enhanced or chemically treated etc