What is the ruling on selling gold on credit if the price of the gold is fixed at the time of payment (market price at the time of payment)? Is it permissible to sell manufactured gold that contains zircon stones at the price of gold, knowing that this is apparent? What is the ruling on working for this company?

The question comprised four issues:

1. Selling gold on credit or with deferred payment is impermissible. This is based on the hadith: "Gold for gold... hand to hand." When exchanging gold for gold, it is necessary to have equality in quantity and immediate possession. When exchanging gold for silver or currency, immediate possession is necessary. Delaying payment constitutes riba an-nasi'ah (riba of delay), and it may also be riba al-fadl (riba of excess).

2. Selling gold for gold with a manufacturing fee is forbidden. Equality in weight is required.

3. Selling gold containing zircon stones at the gold price: If sold for silver or paper currency, it is permissible, provided it is clear to the buyer. If sold for gold, the stones must be removed to determine the exact quantity of gold and ensure equality.

4. Working for this company is impermissible, because it deals with riba (usury/interest), and working there is a form of assisting in what is forbidden, based on the Almighty's saying: "And do not cooperate in sin and aggression" (Quran 5:2).