You can refine the edges of tempered glass by following these four simple steps:
First, you have to wear safety goggles to protect yourself from the possibility of flying glass pieces. Also, make sure to wear thick gloves because you will be handling sharp edges.
Next, you have to lay the glass down on a hard, flat surface. Doing so provides a stable platform where you can work efficiently.
You may use a whetstone to soften the glass. Do this by running it along the edges of the glass. Make sure not to apply too much pressure, but keep firm and even.
Lastly, use a damp cloth to clean the edges of your glass.