To provide the diameter of the sculpture, I would need specific measurements or details about it. Without that information, I can't determine the diameter. Please share the dimensions or any additional context about the sculpture for an accurate answer.
Sculpture
with instruments for sculpture, even with softer metal instruments for stonecarving.
Relief
i have no idea. Check google.
A sculpture should be free standing. If it is not, it may be a relief: relief: sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background
Possibly sculpture. They carved small stone figurines.
Polykleitos
Civil War
The correct spelling is sculpture (carved stone, or similar material used as art).
Possibly sculpture. They carved small stone figurines known as Venuses.
Figures are carved in high relief with deep undercutting.
Kineton Parkes has written: 'Sculptures of today' 'The art of carved sculpture'