It might be the real Holy Grail | Fr. Z’s Blog

The cup itself is of a kind of agate, like chalcedony or sardonyx.  It is like other cups found in Egypt, Syria and Palestine at the time of Christ.  In the British Museum there are stone cups of the same style as that in Valencia dating to A.D. 1-50.  It is of an odd color, reddish, “like a live coal”, and it is hard to say exactly what the stone is.  The ancient naturalist Pliny describes that stone cups were submerged in oil until the stone absorbed some, and then boiled in acid which modified the organic material and changed the colors of the veins in the stone.  The cup was very finely and accurately crafted and lacks ornament other than a fine band around the lip.

It might be the real Holy Grail | Fr. Z’s Blog

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