Kralik or Ruckl Marbled vase on semi-opaque amethyst base

There's been some discussion in the past about whether this vase is a product of Ruckl or Kralik. I'm on the fence with the attribution.
See other links :
http://www.collectorsweekly.com/stories/116974-rare-yellow-kralik-swirled-or-marbled-o
http://www.collectorsweekly.com/stories/117004-tango-wave-baby
http://www.collectorsweekly.com/stories/78351-czech-glass-furnace-decorated-vase-with?in=442

I've seen the marbling on solid yellow, orange, red and blue tango base color, but not seen it on this semi-opaque dark amethyst base, nor have I seen it include a type of aventurine (which I tried to photograph in pic 3).

Does this patterning including the aventurine on a semi-translucent base help identify a maker??? Incidentally the vertical ribbing which appear vaguely visible on the solid color bases are not visible on this piece, however you can feel the ribbing on the inside.

Pi 4 includes it's larger, perhaps more common daddy!!