The Diamond Mystery Gift is a Free Gift and works just like the regular Mystery Gift but can also give special items. If you have only one Diamond Mystery Gift, you can check inside by clicking "Accept and See", but if you have more than one do the following. First, go to your inventory. Next, go to recent. There you will find your gifts.
Possible gifts:
Fontenot House
Quaint Lodge
Cargo Shed- Lono Lanes
- Zynga Gazette
- Appliance Store
- Chinese Theater
- 10,000 Coins
- Bonus Crew
- 250 Goods
- 20 Population
- 100 XP
- +7 Energy
- Zoning Permit (x3)
- Purple Blossom Tree (x5)
- Seagrape Tree (x5)
- Pig
- USA Passport Stamps
- Needed building/quest item
- Add special items you have found in the Diamond Mystery Gift.
See also: 
Gold Mystery Gift, 
Ruby Mystery Gift
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