I was perusing on Kojima Pearl and saw this 16.9mm Tahitian. It's quite the specimen. I thought immediately of Sheri (La_Corsetiere) and her monster pearls. Large pearls like these are mind boggling - that's a big pearl considering the overall space.
http://shop.kojimapearl.com/collections/loose-pearls/products/16-9mm-tahitian-shadow-pearl
http://shop.kojimapearl.com/collections/loose-pearls/products/16-9mm-tahitian-shadow-pearl