Cheap at Half the Price (Short reads) by Jeffrey Archer Why does she decide that the necklace is exactly what she wants/needs?

Consuela plans to divorce her husband, she wants a gift that is priceless and non-negotiable... something that is hers alone and cannot be considered in a divorce settlement.

"None of the above," said Consuela, placing her fork by the half-finished salad. "I need something that can't be bargained over at a future date, so my gift must be one that any court, in any state, will acknowledge is unquestionably mine."