What is the ruling on investing in companies that pay monthly returns to investors through their work in the diamond, gold, and school trades, given that similar companies (such as Hera Gold and IMA) have been involved in problems, and after some scholars indicated that this type of investment is free from usury, and Deobandi scholars gave a green light to investing in the IMA business unit after extensive investigation?

We have no knowledge of the standing of specific companies. However, in general, it is permissible to engage in Mudarabah (profit-sharing) with capital and invest it with companies, provided that the funds are invested in permissible activities, with adherence to Sharia guidelines. Furthermore, the capital should not be guaranteed except in cases of transgression or negligence, and the profit must be a known, common percentage of the total profit, not a fixed amount or a percentage of the capital.