Watch List notes:

Huge natural emerald, 108.3 carats, ex-Bobby Allison's Sunken Treasure museum. Massive rock of light green color in typical crystal shape with whitish ends, not gem quality (fully opaque) but large enough to make a neat display. With Allison certificate (unsigned) and photos from his museum and of the cover of the April 1991 issue of Treasure magazine, which featured Allison and Carl Fismer and their finds. Recovered from: San Geronimo, sunk in 1751 off the Yucatan peninsula of Mexico

Estimate: $500