What is the ruling on dealing with investment certificates from Faysal Islamic Bank, and how is Zakat to be paid on them?

For it to be permissible to deal with Islamic banks, they must adhere to Sharia conditions and regulations. There is no harm in depositing money in an Islamic bank that adheres to these regulations for investment. The sin for any violations falls upon those in charge of the bank, not the depositor. It is not possible to rule on the mentioned investment certificates without reviewing their contracts.

If the Sharia regulations for Mudarabah are met in these certificates, then the contract is valid and the profits are lawful. Zakat is obligatory on the capital and its profit if it reaches the nisab and a full year has passed over it.