For mum, hands down, no doubt, gold jewelry.
Depending on your budget, spend accordingly but even if it's a tight budget you can get a pendant, or earrings, or something.
She will love telling her friends about it.
She'll remember you got it for her from the holy lands.
Gold prices being lower there - I dont know about that in all honesty.
Gold prices reflect the market.
You can and should visit at least 2 shops before buying from one so that you have an idea of how much leeway you can bargain.
And Yes, for gold, you do bargain, it is NOT fixed prices.
Little wiggle room for smaller items but there is wiggle room.