Monkey Island - Shopping for Elaine

[Mistery]

An unofficial fan-made point-and-click adventure inspired by Monkey Island.
Guybrush is on a mission to find the perfect birthday gift for Elaine and (hopefully) impress her. Explore the familiar yet mysterious Melee Island shop and dive into a fresh, little puzzle adventure with that classic Monkey Island charm.

Play Here

Please use spoilers for hints and walkthroughs:
[spoiler=Title Here]Enter text here...[/spoiler]

Please do not post a video walkthrough for 7 days.

[Mistery]

I've got

many pieces of eight, scissors, grog can, pull tab from grog can, pole, rubber chicken, opened berries jam, government seal > sticky seal, inked feather, sticky portrait

EDIT
Meanwhile I have falsified

a document/ID to prove that I'm the Sheriff.

Now I'm stuck on snatching the diamond, the shopkeeper goes to the safe when I

want to check the papers for it.

EDIT
Got it!

Just close the door of the safe.

Mission accomplished