Weight: 5 lb.
Estimated Value (Sane Cost Guide): 70,000 gp
DMG Value: 50,001+ gp
Crystal Ball of True Seeing is about 6 inches in diameter. While touching it, you can cast the scrying spell (save DC 17) with it. While scrying with the crystal ball, you have truesight with a radius of 120 feet centered on the spell's sensor.
Source: DMG p159