Dear Linda, I am so very sorry. Here are a few theories I have.
Pilot Mountain Turquoise has a natural tendancy to have light
highlites of purple. It could be that the ring had been stabalized
with wax, and heat of your journey and 80 years of wear have worn
off. That is the distant theory, the other one is that something you
have touched or heaven forbid, was in the air has altered the ring.
Turqoise is not a strong stone. It has a tendancy to crumble and
break. Today they use a wide range of stabalizers. 80 years ago they
used only a few. Your matrix may have been wearing away and that led
to contamination. So my final guess is that the stabalizing has been
compromised and something (dish soap, shampoo) has settled into the
area of the matrix. Or it could be all of the above.
Now we just sit back and listen and learn from the experts that are
going to come out with their knowledge.
Just a funny post script. I had a booth at the Alaska State Fair on
Sept 3. All over the US, people are evacuating because of
hurricanes. Which have about 60mph winds. We had recorded 80mph
winds and what do Alaskans do… they go to the Fair. It
was misery! Didn’t even cover my booth fee. Then yesterday we had
100mph winds and power outages all over the state.