This was absolutely ages ago. As you all know the head prices absolutely soared in mid 2020 when COVID-19 hit.
Well, since Caleb decided it'd be a good idea to dig this grave up, lemme post an update pic for Mos Mos started replacing the floor of the island with diamonds instead of having it on the walls. At one point there was roughly 100-ish diamond blocks left, which I sold my second placed Noobcrew head for and finished myself. In total, there is approximately 3,788 diamond blocks placed on the island