The item shown is the exact one you'll receieve. This is a particilarly large and high grade piece. 
 
Measurements approx:
Weight 384g
Length 12.5cm
 
Grape agate is a rare type of agate found in indonesia that has unique healing properties. It is said to bring balance, emotional peace and harmony to the wearer, grounding, protecting and calming them. It is believed to help support meditation and relaxation, as well as aiding in self-confidence and creativity.