Stress cracking common in rimless glasses?

I've had my first pair of rimless glasses for about a month and a half and I
recently noticed a small crack on the left screw. It's going up toward the
top of the lens and it's been slowly getting longer.

Is this common with rimless glasses? Should I take them back?

Thanks.

 

It does happen. Take them back.

 

Yes it is reasonably common. It is very common if you clean your lenses with
acetone.
If you've only had them for a month, and if it's obvious that you've looked
after the specs (i.e. no other damage, scratches, bending, etc) then they
should be under guarantee.
Dom