When your friend signs up on the titan.tf website with your referral link, you and you friend instantly receive 5,000 gems each.
They must have never logged in onto the titan.tf website before, and have never connected to any titan.tf server before. The player must be a fresh new player on Titan without a "Titan Account". Logging in onto the website or connecting to any server for the first time using their Steam account will create a "Titan Account" for them. *this offer is only applicable to website signups and they must click on your referral link before signing up in order to be eligible