And from the History Blog again, a post about more discoveries from the Mycenean site of Pylos in South Western Greece. These are digs close to the so-called Palace of Nestor (Nestor being King of Pylos and having fought on the Greek side of the Trojan War).
One of the original finds include a small agate sealstone made on Crete, so of Minoan manufacture. This is the "Pylos Combat Agate" and is described in more detail here. It is under 4cm long and exquisitely carved into the very hard quartz agate. The detail is stunning.
This is 3.6 cm long (click to enlarge) :
From the post :
one tiny agate sealstone of Cretan manufacture emerged from its thick lime accretion to reveal itself as one of the greatest masterpieces in ancient Greek art, far more advanced in craftsmanship than anybody realized the Minoans were capable of in 1,500 B.C.