This is from the Kvatch Aftermath questline and I've forgotten where the ruby is inside the cave, any help?

It's in a container you haven't found yet. Try slowing down and looking around instead of playing in a hurry-up mode.

Thanks I did find it and your right I must of passed in about three times without realising due to me trying to do it as quickly as possible.

Theres was on the ground outside the chapel and one in the counts room.

not in Kvatch afermath..dude