I've come across this UI element
I tried to copy.. and realized I couldn't.
- Do the semicircles use some sort of gradient?
- Is it possible to apply such gradient in Figma?
Yes you can do it in Figma. These are actually just simple linear gradients from top to bottom, and the semi-circles are actually regular circles.
The top color is close to the one in the background, and the bottom color is either the same as the background or just 100% transparent.
See below image, the objects are selected hence the blue outline.
And this is the same image when it's not selected: