possibly a plumb bob?

My husbands aunt gave us this stone peice to research for her, and we are not quite sure what kind of stone or what it actually is. We have been told possibly a pllumb bob or some kind of a antique tool.

She took it to an antique place and they thought it was soapstone, but were not sure what it was really. To me it looks like it could be Jade, you can not scratch it, and online they say soapstone would scratch if you took a knife to it.

Any information would be helpful!