Polishing!

Vevor faceting/polisher. There are multiple ways to polish rocks, including by hand, with a rock tumbler, or with a Dremel: By hand Clean the rock, then use sandpaper to roughly shape and remove scratches. Start with 220-grit sandpaper, then move to 500-grit, and finally 1200-grit. With a rock tumbler A rock tumbler, also known as a rotary drum tumbler, rotates rocks inside a barrel to polish them. Some say that running rocks in coarse grit for two to three weeks can help them achieve a better shape. A vibratory tumbler can polish rocks faster than a rotary tumbler. With a Dremel Use a Dremel to shape and sand the rock, starting with the lowest grit and working your way up. A toothbrush can help remove buildup from crevices. You can use a variety of polishing compounds, including oxides of cerium, tin, and chrome, as well as Zam, a mixture of aluminum oxide and chrome oxide. Newer polishes are often superior to older compounds. If your polished rocks aren't shiny, it could be because you used the pre-polish grit instead of the polish, or because there was carry-over abrasive from a previous step. You can use polished rocks to make jewelry, crafts, decorations, or just collect them. - https://www.google.com/search