The future of the Greek jewels remains a mystery. I suspect the boys have the resources to keep their respective share and not sell for the money, but I do not know the financial position of the daughters. Also, we do not quite know how the jewellery will be divided between the children.
As regards the jewellery of the Gloucesters and the three Kent siblings, I guess it will all just get sold at auction in time. The Gloucesters and Prince Michael of Kent have done well do keep most of their respective jewellery collections together thus far, though I suspect the next generation will have little use for most of it. Princess Alexandra, unfortunately, received little royal jewellery from her mother.