A bride to be has lost her diamond engagement ring somewhere while visiting her sister in the Lands of Xenora. Go help her by replacing the lost ring.
Find Summer’s house – near the lake, right off the main path to Xenora after you gone all north a bit from the lanerell dragon caves
Go into mines
Nw, e, u, n, ne, d, d, d
Somewhere on that level you can ‘search debris’ and find a pickaxe then go find something gleaming in the wall and ‘mine diamond’
Take it to Euphaestes in Xenora and have him refine it
Give diamond to Summer