Hello it is possible to get more than one Omrabas' heart.
To collect more than one Omrabas’ heart, make sure that the heart is not in your backpack (you can throw the item on the floor or put it in the depo). Then talk to NPC: Hi-lost
Here you have official fansite and way how to get as many as you want.
https://tibiahome.com/decoration-items-obtainable-from-the-gravedigger-of-drefia-quest/
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