Hexagon gem: first draw a hexagon, then draw a small hexagon with the same shape in it, and then connect each corner of the small hexagon to each corner of the big hexagon.
Octagonal gems are drawn in the same way as hexagons.
Round gem: draw a circle, and then draw a light spot.
The above is the most basic and simple way to draw gems. Of course, if you want other graphic gems or more exquisite paintings, please add my QQ: 7 10402839.
All of the above are played by myself.