Cyndayco,
Yes, I agree, the black or dark gray multi-ply designer wire probably will be best for this design. It is coated, so relatively soft against the pearl, and a little spacer will fill in the gap nicely at either end of the pearl, sort of a punctuation mark. Very interesting color combo, as sometimes labradorite has golden and warm flashes besides the blues. Gonna be soooo pretty!
Of course, I most often use Beader's Secret, but sometimes hole size and drape of the necklace work better for me on wire.