Lady's Black Tahitian Pearl Necklace. Pearl Size: 15.00-17.00mm Necklace Length: 16" Contains: Twenty-Five Cultured Tahitian Pearls. Size: 15.00-17.00mm, Color: Black, Origin: Tahiti. This is as fine a strand of black Tahitian pearls that I have ever had the pleasure to own. This strand includes 25 round natural black Tahitian pearls. Currently, the strand does not have a clasp, but my tasteful wife could arrange a selection of clasps that I assure will be most fitting for the buyer to choose from. The two valuable assets that this pearl strand has is that these are true black, and besides the exceptional color, these mammoth pearls are of exceptional size; a global 15.00-17.00mm. If your lady loves pearls, she will surely love these.