In a classic Lupin-style irony, the "Jet-Black Diamond" is revealed to be black pepper . A century ago, pepper was so valuable that it was nicknamed the "jet-black diamond," making the "treasure" worthless in the modern day.
Fans have jokingly compared this episode to One Piece due to its focus on pirate treasure and a scene where Goemon is seen training by slicing a giant squid . LupinIIIPartVI_Ep_09_ITA.mp4
The series is known in Italy as "Lupin III - Una storia senza fine" ("An Endless Story"). The Italian dub for Part 6 notably recast almost the entire main cast except for the voice of Jigen. In a classic Lupin-style irony, the "Jet-Black Diamond"