ANSWER: Allah forgives all sins, including shirk as long as the person sincerely repents to Allah while showing deep remorse. However, if a person dies without repenting from shirk, this is what Allah doesn’t forgive and that person is doomed in hell forever. 

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ANSWER: No problem in having a headstone with deceased name for identifying the grave but it’s totally prohibited to inscribe or write ayahs of Quran on the stone or to resemble the way of the Christians by using marble or the likes for decoration!

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