Adding effects to stacked render calls?

I have some diamonds with refraction on the screen, see: https://codesandbox.io/s/dank-river-gdkbg they are rendered imperatively in Diamonds.js Line 80

I wish i could put a glow on these diamonds, like so: https://codesandbox.io/s/intelligent-http-ejh0e same file, same line.

But now the background is gone. I don’t understand how to mix rendercalls and effect composition. Is this possible somehow?

PS. you need to screen down to see the diamonds.