Giant clam pearl?

Sweet Lord!
Just the name of the pearl itself leaves little doubt: "Massive Natural Ocean Pearl from Giant Clam Pearl Ultra Rare Australian Opalized Giant Pearl"

Looks like a Chinese Freshwater pearl to me...a Fireball.
Definitively NOT: opalized (what the heck do they mean by this!), nor ultra-rare nor Australian.
Or they best should have a Certificate issued by a prestigious Gem Lab.