You can buy diamonds from Wallet → Buy Diamonds. Payments are processed securely through Paystack, so you'll pay in Naira using your card, bank, or other Paystack-supported payment method. Diamonds are added to your balance automatically as soon as your payment is confirmed — there's no waiting period or manual approval.
Keep in mind that diamond purchases are non-refundable, so double check the pack you're buying before confirming payment. If a payment goes through but your diamonds don't appear, contact Support through a ticket with your payment reference so it can be looked into.