Is the husband entitled to keep his first wife's gold necklace, which he found in his possession, knowing that there were disputes between them that led to divorce, and the wife wishes to obtain all her rights?

The husband is not entitled to withhold the wife's marriage contract from her, and he must return it to her.

If the husband divorces her without a condition to waive her rights, then she is entitled to all her rights. If she seeks Khul' from him or if he stipulates the waiving of her rights in exchange for the divorce, then she is entitled to what they both agreed upon. In case of dispute, the matter is referred to the court.