This is the last filter of the 2020 series (apart from Style G, for which -as you know- I'm waiting for a new Gimp release, to double-check it).

The characteristics of this filter is the use of G'mic Cristal Background filter.
Users may choose the hue to apply to the crystals edges, for personalizing the look (default is 60, yellow).
Users may choose to have a frame. G'mic Cube Frame is used.
Users may choose to copy the original on top, masked.
The mask can be WHITE, BLACK, GRAY-COPY of the image.
The masked layer by defaul has a mode=BURN and an opacity of 50%.
The effect is:
- WHITE MASK = strongly increase of colours and contrast
- BLACK MASK = no effect UNTIL THE USER DOES NOT PAINT OVER, to force the effect on stroked areas
- GRAY COPY MASK = delicate increase of contrast

Here the filter:



Users may add quasi-endless effects, to improve the colours or the crystal look.

Outcome examples on the correlated thread on Gimp Art Topic.