Mutual consent for divorce

My elder brother got married on February 4th, 2018. Both, my brother and his wife are working in Muscat, Oman. After marriage, first 2 months, both were happy and all but then later on both of them started having indifference between them. Both of them tried to stay together for 6-7 months but eventually agreed that both of them cannot stay together. So, both of them have agreed for a mutual consent for divorce. Now this is what I need to know: Both of us i.e, my brother and my family and the wife and her family have agreed upon the settlement/maintenance cost. We have agreed to pay Rs 5,00,000 lakhs as settlement/maintenance costs ( which the wife and her relatives have agreed) and also her gold which is 70gms. Even they have agreed to return 88gms of gold which we had given to them. Me and my parents are a little confused because we don't know whether we should give the above mentioned money and gold inside the court or outside the court. And secondly, what if they (wife and her relatives) give us imitation gold instead of our 88gms of gold ? Waiting for a quick response.