Yes, you can make a contact ring even on silent Iphone by following these steps:
1. Go to the Contacts app on your Iphone.
2. Find the contact you want to make a ring.
3. Tap on the contact to open its details page.
4. Scroll down to the bottom of the page and tap on the edit button.
5. Tap on the ringtone field and select the ringtone you want for this contact.
6. Tap on the save button to save your changes.