Red Sage Sphere, China, 3.9 inches in diameter.
This might be red stromatolite. The use is a highly silicated limestone. Really made the saws sing when I was cutting it. Not a high polish, but the contrast between the red and grey is pleasing.
for an example of how this material polishes, click here or copy and paste: https://www.facebook.com/reel/1643035930169923