(CNN)A miniature gemstone discovered in a 3,500-year-old tomb is challenging our understanding of ancient Greek art. Now, nearly three years after it was originally discovered, experts are still trying to fathom how it was crafted.
The ancient Greek masterpiece etched on a tiny gemstone
1 of 11
2 of 11
3 of 11
4 of 11
5 of 11
6 of 11
7 of 11
8 of 11
9 of 11
10 of 11
11 of 11
The limestone-encrusted gem was one of 1,400 treasures found buried alongside a mysterious Bronze Age man -- dubbed the Griffin Warrior -- in Pylos, southwest Greece.
Husband-and-wife team Jack Davis and Sharon Stocker from the University of Cincinnati led the excavation near the ancient Palace of Nestor -- a site mentioned in Homer's epic poems -- in 2015.
Today experts are still poring over the jewels, weapons and armor, searching for clues about the ancient world at the dawn of European civilization.
One tiny object measuring just 3.6 centimeters (1.4 inches) was initially overlooked and mistaken for a bead. But, beneath the limestone was a meticulously carved gemstone, now considered one of the greatest prehistoric Greek artworks ever discovered.
It is so tiny that a microscope is needed to fully appreciate the mastery of the engraving, as some details are just half a millimeter (0.0197 inches) in size.
However, no such magnifying tool is known to have existed in the ancient Greek world.
"The amount of skill that was required to execute such an intricate design on such a small surface is unbelievable," Stocker tells CNN.
It shows detailed understanding of the human body and movement which, until now, was thought far beyond the ability of Bronze Age artisans, she says.