The following is an excerpt from Physorg; click on the above link to read the full article:
A rare and surprising archaeological discovery at Tel Dor: A gemstone engraved with the portrait of Alexander the Great was uncovered during excavations by an archaeological team directed by Dr. Ayelet Gilboa of the University of Haifa and Dr. Ilan Sharon of the Hebrew University of Jerusalem.
This sort of intricate artwork reminds me of artwork on grains of rice. So unlike Ramesses the Great, Alexander put his image on even the tiniest of material. I'm not surprised this artifact ended up in Israel; after all, Alexander traveled to many faraway places.