it is best to make a plate with stainless steel if it is a corner of the plate, such a triangle. it will be such a decorative bayer

you just need to shape it nicely, because there is no other advice. if you grind the sharp edge of the plate with a diamond file, you will have frosted glass and it will not look elegant. glass water, even when it hardens, the interference in this defect will be visible. unless you burn yourself with hydrofluoric acid, this place in some es-flores. to buy this acid, unfortunately, you need to have a special permit :(
Added after 1 [minutes]: I'm sorry, something like the letter 'd' is cloning