Under karating

Anyone care to comment about under karating? In particular, 10K being
sold for 14K. Every so often there are exposes in the local media on
shops that have sold 10K as 14K.

From what I saw they tended to be in flea market-type environments.
Would you advise against shopping for 14K in flea market or jewelry
bazaar type settings?
Do you still run some risk getting underkarated jewelery even from an
established jewelry store? ( I guess the owner would even be unaware
of it)

I've been told best the best way to choose a 14K piece is to look not
only for 14K stamped on the ends and clasp but also for initials ( the
manufacturers?) and that something marked 14K Italy with initials is
most likely the best bet.
Is this true?

Thanks again.

Bill