There are a few methods to distinguish a diamond from other gemstones, like the fog test, for example. Bring the stone to your mouth and breathe on it. The surface will hardly fog up from the heat of your breath, as diamonds have a very high thermal conductivity, and the fog will dissipate almost immediately if the stone is real. If it takes at least a few seconds for this to happen, then you hold a fake. Another method is called the dot test. Draw a dot on a flat white surface. Put a stone on it, flat side down, and look through the pointed side at the dot. If you see it, then the stone is not real. It’s impossible to see or read anything through a real diamond.
Phianite is a synthetic stone, and it often doesn’t have any inclusions or imperfections, while stones of natural origin, like diamond or zircon, are more likely to have at least some foreign particles inside.
Zircon looks like phianite, but it’s much more expensive, as zircon is a natural mineral. Therefore, if the price of an item is impressive and the seller claims that it’s because of the stone, then you most likely have a natural zircon, not a phianite. The main difference between zircon and a diamond is that it refracts a ray of light passing through it into 2 rays, while a diamond does not.

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