How can I smooth the chipped edge of a lead crystal platter?

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The edge of a glass serving platter has been chipped-about 1/2 inch along the edge and about 1/2 inch deep. I know it won't look perfect but I would like to smooth out the sharp edge so it is usable. Thank you for any assistance!
q how can i smooth the chipped edge of a lead crystal platter
Chipped lead crystal serving platter. 1/2 inch x 1/2 inch.
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