Here is the code:

// Dreamy Diamond
// by Rangga Purnama Aji
// https://ranggapurnamaaji1.wixsite.com/portfolio

osc(7, -0.125)
  .modulate(voronoi(1))
  .diff(voronoi(1).mult(gradient(-1).luma(0.125)))
  .luma(0.125)
  .add(
    shape(7, 0.5).mult(
      voronoi(10, 2).blend(o0).diff(gradient(1)).modulate(voronoi())
    )
  )
  .scrollY(-0.1)
  .scrollX(0.125)
  .blend(o0)
  .blend(o0)
  .out();

Here is the video: