Glass tile is a great consideration.

What is your pool shape?

Why would you want pool coping with sharp edges? You will be getting constantly scraped.

By sharp edges I mean square edges like the picture attached.

I like glass tiles too, but I was wondering on what colors give it that contemporary look. The shape of my pool is rectangle.

There are multiple choices of tile. My suggestion is to get all 3 three materials, plaster, coping and a tile choices together. Bring them outside and observe them in the natural light. That should help in your decision process.

When we install coping as shown, it's generally Limestone or Blue Stone. We will sand the inside edges just to take the sharpness off.