Some of these pieces - perhaps around 8 - simple melded in and could not be seen anymore. Only around 7 of the larger pieces of the original remain, as seen in a hand-drawn diagram traced directly on top of the Ḥajr (below) in the year 1957 CE.
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However, over the course of the last few decades, and in order to protect the Ḥajr, an extremely expensive mixture of frankincense, ambergris and other compounds is poured as an outer layer over the stone, so that the continual rubbing and kissing of the Ḥajr doesn't wear it out and so that it is protected with a layer. Hence, if you were to stand in front of the Ḥajr and had time to examine it (theoretically!), you would not actually be able to see the original stones of the Ḥajr; only the shapes are vaguely discernible.