Bioluminescent, Capture the resplendent opulence of a crystal-encrusted skull, meticulously sculpted with filigree reminiscent of Byzantine art. The skull, crafted from a luminous, pearlescent material akin to polished bone, rests upon a bed of rough-hewn, dark obsidian. A diaphanous, otherworldly luminescence emanates from beneath the skull, casting long, tenebrous shadows across the scene. The crystals, a mesmerizing array of aquamarine, amethyst, and rose quartz, sprout skyward, their facets catching and refracting the spectral light. Utilize a chiaroscuro lighting technique, employing a singular, focused light source to accentuate the intricate details and cast the scene in dramatic contrast. Opt for a shallow depth of field, blurring the background to further emphasize the skull's exquisite detail and ethereal beauty. This composition should evoke a sense of grandeur and the sublime, juxtaposing the macabre with the beautiful, the earthly with the ethereal.