It says on this site Gary's networth is $40m -
https://networthpost.org/gary-lipovetsky-net-worth/ (though I'm not sure how accurate that would be)
I think they are very savvy with money, and maybe for very wealthy people they don't live *that* extravagantly in terms of their house; it seems quite modest (for millionaires), as it's quite basic and sparsely furnished. And they've been quite good at delegating their time to be as effective as possible to achieve different revenue streams across all platforms and categories - high street fashion, luxury fashion, beauty, home/domestic life. And maybe invested the profits of these into the jewellery business so have another income stream once Valeria stops looking quite so child like.
She must be doing other things to her face to still look like a baby. But whatever it is, it looks so natural so fair play to her.