Indian sandstone flags - advice plse - Advice on indian flags

[andicole]

Hi All,
newbie here - seeking advice please
I have recently purchased a quantity of Indian Sandstone flags and have a query about how flat the surface of the flag should be.
I appreciate these are natural stone and therefore would not expect a finish any where near that of a patio slab, however I was surprised at the number of flags that had quite large dips/grooves etc. Some of the flags have large grooves/dips over 10mm deep.
Is this to be expected or should I still expect the flags to fit within
certain tolerances

Any advice would be appreciated
rgds
Andy

[Tony McC]

There are no tolerance standards for imported riven flags, and what you might consider to be overly lumpy-bumpy, others might think of as lacking in character.

Generally speaking, all but the really crap imorted stuff would be deemed as "acceptably riven" by most in the trade.