Is it permissible to put a piece of metal or a marker on a grave on which is written verses of the Qur’aan in addition to the name of the deceased and the date of his death, etc.?

Praise be to Allaah. 

It is not permissible to write anything on the grave, whether it be
verses of the Qur’aan or anything else, on iron, stone tablets or anything
else, because it was reported from Jaabir ibn ‘Abd-Allaah (may Allaah
be pleased with him) from the Prophet
(peace and blessings of Allaah be upon him) that it is forbidden to
plaster the walls of graves, to sit on them or to build over them. This
was narrated by Imaam Muslim in his Saheeh; al-Tirmidhi and al-Nasaa’i
added, with a saheeh isnaad, “or to write on them.”