first you have to have a diamond ring looted in the soldier job tier. if you have one you can already gift that by going to the gifting tab in the inventory. if you are after the achievement "that's amore" you must give that ring to a mafia lower than level 8.
you get it from a early mission, unless you played long time ago when it was a gift.
This ring and all other rings are obtained in the Hitman Level of Mafia Wars. The rings are dropped randomly when you do different jobs in that level. You can also ask your Mafia Wars friends if they have an extra ring and they can gift it to you.
Any of the Hitman tier jobs
Diamond ring is one of the vault collections you obtain doing jobs on the hitman tier of New York.See related mafia wars wiki link.its a random drop from the hitman tier
by giving a Diamond Ring on a below level 8 mafia..just try coz i got 1
if you click on whats this? on mafia wars next to bribery ring it will tell you.
Mafia Wars no longer has this.
That's amore you can get by gifting a diamond ring. So if you have one (look in your collections), send it as a gift to one of you Maffia, BUT it has to be someone below level 8 ! So if you don't have, ask a friend who doesn't play to join maffiawars and give him a diamond ring. Easy achievement ;-)
You can get politico corrupto special loot cuba mafia wars from Bribery Ring in cuba business.
hitman job tier
To get a falsified document in Mafia Wars you must complete the "Underboss" job "Take Over an Identity Theft Ring".
To get an emerald ring you have to do jobs in the hitman tier which could take a while.