silver & amber ring?

Picked this ring and a couple others from a thrift store today all for 2 bucks, I think its amber but wanted other opinions. Looks cloudy and green under uv, warm to touch but I know enough to be dangerous!
Here are some pictures,

 

Looks edible



Please include marks

 

Amber mounted that open in a ring wouldn't last a few days without serious damage to the "stone".

 

I see no fluorescence in the UV photos, so no amber, sorry. Maybe bakelite?
A dark colour amber like that would look something like this under UV:



Same necklace in natural light:

 

here's the best I could do with the mark,

 

I see 925 at the beginning... but can't tell the rest.

 

It looks like 925 CTX but even under the microscope its a bit blobby.

 

925 STG, both stand for sterling silver.

 

here are some more pics, tough to get focus right. the specks shown are in the stone itself.

 

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It looks a little like carnelian, but it would be cold to the touch if it is.

 

Did the hot pin test (I know not recommended) and a definite resin smell.