This is not the grail that was used in the last supper, that was entirely different, and as said probably of clay or wood. But we must remember that
Jesus was a guest in another home, and one of high status, so stone or even something else may have been used.
But that is getting off the subject, the Deval Grail is not something from the Last Supper, but an unguent jar that was used to contain oils and
spices for anointing. The anointing of a dead body was a strong tradition of the jews, and so was collecting any spilled blood of the deceased, which
would have been buried with the body. This also would have included anything with blood on it, such as the nails, crown etc. etc. Therefore this
cup was not a drinking vessel but an emptied unguent jar that was used to collect the blood.
As I mentioned in my previous post. Even if this jar is not connected with the crucifixion, someone during the crusades thought it was, and venerated
it as a Holy Relic. This was at the same time that Chretien de Troyes first wrote about the grail. So this little cup may have been the very item
that started all of this grail stuff. And it would explain too, the Royal Blood connection, as that is what this is reputed to have or still does,
hold.
There are probably a few real grails out there, or were out there at one time before being lost or destroyed. Maybe this is one of them. We'll
never know, unless someone finds a Tardis