How many of the existing jewelry materials are formed in the body of shellfish?
Correct answer: 1

Alas Ken
If theres pearl and mother of pearl, then there's more than 1.

Castra
Alas Ken,
Mother-of-Pearl is formed on the inside of the shell, not in the body of the oyster.
Most shellfish have a coloured, shiny layer on the inside of their shell, so it is pretty, but not prized as a gem-stone.
Mother-of-pearl jewellery can be bought quite cheaply on most Mediterranean island sea-fronts.

Jonesy
Wally McGhee 🐥, there is a report button that anyone can use.

Tee
Mother of pearl and abalone SHOULD be in this question. Leaving them out is unacceptable. Toss this question!

Tee
Mother of pearl and abalone SHOULD be in this question. Leaving them out is unacceptable. Toss this question!

Wally McGhee 🐥
Agreed. There is abalone and Mother of Pearl. The question is worded badly and should be removed. I wish there was better vetting here.