Re: dispute in inherhitence
Then how did you know about it? 
Anyway….it doesn’t really matter. I am also far from being a scholar but I agree with what crab man said. You didn’t write anything about him being a bad husband so it sounds like he kept your sister very happy during the 10 years of their marriage. There is no doubt that your sister wanted him to have half of the jewelry b/c she made a will about it while alive. Whether or not he contributed any money towards the wedding jewelry does not matter b/c your sister obviously did not care about it….she knew who paid for her wedding/walima jewelry and still gave her husband half of it.
If I were in your shoes….I would stay focused on what your sister would have wanted and what would’ve made her happy. What Crabman says seems fair and on par with your sister’s wishes. Divide the jewelry in half like your sister wanted…….take out the amount he borrowed from you….and give him the rest.