[user104658]

On personal physical assets (right up to things like expensive cars/boats/etc.) yes, on "liquid" wealth and property no. If you have an issue with someone you intend to marry getting half of your wealth on divorce ... don't marry them. IMO who deserves what after several years of marriage becomes very murky, anything other than a 50/50 split is questionable in terms of fairness, because questions like "would partner A have been able to maintain this wealth without partner B's role in the relationship e.g. child-raising" strart to come up and are all but impossible to properly answer ... it's guesswork.

There should however be legal avenues that can be pursued when there's evidence of actual "love fraud" - i.e. the person was only EVER intending to marry and then divorce for financial gain, and had no intention of maintaining the relationship.