While romanticized literature describes the Grail as a chalice, this is a much later derivation, extrapolating from Celtic tradition in which the Grail is described as a platter. Many vessels would have passed through the hands of Jesus in his short lifetime…probably humble clay and wooden bowls such as the famous Nanteos Bowl. This medieval relic, long kept sequested in Wales, is thought to be made of olive wood, and was originally revered in Glastonbury Abbey. According to tradition it was secretly carried away to avoid plundering by agents of Henry VIII. The Nanteos relic is a fragment of wooden bowl credited with miraculous healing powers, with well-attested healing effected as recently as the 1950’s. This also is not the Grail, such a humble vessel with proven powers would perhaps be a stronger candidate for having been used by Jesus. Many manifest vessels can hold Grail power, according to human intention, attunement, and practice, but no single one is the Grail itself.
http://en.wikipedia.org/wiki/Nanteos_Cup
The Hidden Adept & The Inner Vision
http://www.chalicecentre.net/light-of-the-west.html
Prayers and Reflections 