Here is the rough casting with the gates still on (the gate, or button, is the nub that remains after the sprue is cut off... what's a sprue? It's the tube where the metal flowed into the ring)
I use a file to remove the light grey crust that forms on the casting when it cools. I also use it to shape the ring and true up the overall form.
My flexible shaft, or flexshaft is the best tool a goldsmith has. You can put different grinding and sanding tools in it to smooth the surface of the ring before polishing. This one is a silica based abrasive called a grey wheel.
Here is the rough casting with the gates still on (the gate, or button, is the nub that remains after the sprue is cut off... what's a sprue? It's the tube where the metal flowed into the ring)
I use a file to remove the light grey crust that forms on the casting when it cools. I also use it to shape the ring and true up the overall form. 
My flexible shaft, or flexshaft is the best tool a goldsmith has. You can put different grinding and sanding tools in it to smooth the surface of the ring before polishing. This one is a silica based abrasive called a grey wheel.
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