When it comes to Wills my family have always operated on a “no surprises” basis.
Discussions were had before Wills have been drawn up so that everyone is clear about the what’s/whys and importantly have a chance to ask questions whilst the person is still alive so there was never any possibility of people being left wondering or misinterpreting bequests.
Personally I’d discuss the issue of your jewellery with both your children.
There are lots of ways to make this fair even if you leave it to your daughter.
For example the items are valued on your death and your son gets 50% of the value from your daughters share of your estate or he could be left items of equivalent value.
Given your son’s circumstances it’s doubtful he would want the female jewellery anyway, so that makes things a lot easier.
But don’t necessarily assume your daughter would want all your pieces and then potentially be faced with selling them and/or losing part of your estate in trade for something she doesn’t want.
For example my great aunt had a lot of good jewellery (worth similar amounts to yours) and it was left to my mother and myself.
The thing is that very little of it was to our taste. In the end we sold most of it keeping only a few items one of which I had remade/reset.