Is it possible to tell a Valyrian steel sword from a very well crafted steel sword, by sight alone

I'm sure in Westeros there are some incredibly well crafted steel swords, but could someone instantly spot a Valyrian steel sword over one of these?

Does Valyrian steel have any visual indications that it is Valyrian steel and not just a very well crafted steel sword?

I'm wondering, in canon, has anyone seen a sword and instantly recognised it as Valyrian steel.

For the purpose of this question, no one is allowed pick up or use the sword, so they cant feel it's weight, balance, sharpness, etc...