I love gemmy blue Peruvian opals and bought many strands & items
over a period of a year or so. The vast majority were not opal and
were returned. Most of what you see on ebay is dyed this-or-that.
“Peruvian Opal” has become a trendy name for a certain shade of blue
and many sellers don’t seem to make a distinction between the use of
PO to denote color vs the real thing.
Even higher end B&M stones are not immune. Not long ago I bought a
necklace of tiny PO briolettes. Took them home, decided that the
color was a bit pale for PO. Viewed with a polariscope and found that
they were not PO. The store where I bought them is a local shop, high
end, and they make much of their inventory. They bought the two 8"
strands used for this necklace from a GIA certified person. How
embarrassing for them.
Further testing showed that they were dyed chalcedony.
I haven’t seen any really good quality (translucent, little/no
matrix) PO in quite a while.
If you find a good source of high quality PO, please let me know…