Open the Gifts window and go to the Gift a Collection tab. There you will see all the collection items you've found. Any of these can be sent as a gift to your friends. To send an item, choose it from the list and tap the ‘Send’ button. In the window that opens, choose the friend you want to send this gift to and confirm your choice.
Note that you can send only 10 collection items per day. However, you can go around this rule with the help of a few diamonds!
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