on the previous thread of finding “shell pearls”:
i just got the book “jewellery moves” by amanda game and elizabeth
goring from the library.
on page 26 of the soft-back book (sometimes the pagination is
different in the hard-back book.), there is a picture of a necklace by
rowena gough. the caption says it is made of “mother-of-pearl shell
buttons.” the text on page 27 says “…sensual neckpieces from
mother-of-pearl shell buttons. Pearl shell buttons… Australia
supplied over seventy-five per cent of the world’s shell buttons…”
from the text, it seems to me that “pearl shell” was used to mean
mother-of-pearl. that makes sense, since i gather that the pearly
substance of mop is not a pearl but part of the shell.