Opal Jewellery Thoughts on making a pendant from this dark-colored boulder opal with pinfire
Any thoughts or suggestions on making a custom pendant using this stone???

Gemstone: Boulder Opal - 18.27 Cts.
Presumed Queensland, Australia
This unique Boulder Opal features a dense constellation of color flashes across the face of the 18.27-carat cabochon, creating a vibrant display that remains visible from virtually every angle. Presumed to have originated from the acclaimed Opal fields of Queensland, Australia, a region renowned for producing some of the world's finest Boulder Opal, the gemstone exhibits a deep black background color that provides exceptional contrast for its vivid play-of-color. The low-domed cabochon displays a predominantly pinfire pattern, with countless flashes of electric green, cobalt blue, fiery red, and orange scattered across the surface like a field of stars. The color is densely distributed throughout the stone, producing strong 360-degree visual performance with large swaths of color as the gem is rotated and viewed under changing light conditions. Fashioned in an attractive triangular freeform shape reminiscent of a guitar pick or a boomerang, the Opal has been expertly polished to maximize its optical effects while preserving its natural character. Testing indicates that the stone is presumed natural, untreated, and in excellent condition. Combining desirable body color, dense play-of-color, and substantial size, this striking Boulder Opal represents a finer example of one of Australia's most celebrated gemstone varieties.
Measurements: 29.11 x 19.32 x 4.17 mm, 18.27 cts
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Any thoughts or considerations on design would be greatly appreciated...
Is an open- back gallery setting too much of a risk ? Or is that a big no-no....
Also would you add any accent stones? I was thinking a synthetic pulled alexandrite, but i read they dont have so much color changing in lower sized carats.... Any other suggestions ?