What I find is that brown/rust orange plumes begin to infuse the
surface and then the interior of the stone.
I have been working with top grade Larimar for several years now and
I have never have that happen to me. I use only water,no oil, when I
saw it. Might that be the reason? Somehow I doubt it. Then I grind
down using diamond sintered laps, 220 and 1200 with water, and I
polish using olive oil mixed with diamond grit. 1200, then 14000,then
50,000 then, if it is a really good piece, 100,000 grit. ( for that
'wet' look) My gut feeling is that you picked up a bum parcel, maybe?
The atmosphere here in St Maarten is immensely corrosive, so much so
that 18ct tarnishes in weeks and tools rust with wild abandon. So far
all my larimar has behaved as is should. I would love to see a
picture of your discolored Larimar. Forewarned and all that stuff.
High season is coming up and then the Dominican sellers come round
I'll ask about this, for sure. I'll post what they say. Quite
worrying, I must say. Also another thing that I heard is that
Larimar is photosensitive, and that it fades in sunlight. I put a
piece in sunlight for a while now and there is no visible difference
with the control piece.Yet... I would be less than popular if some of
my carved stuff did a wobbly, I tell you.I only set my stuff in 18ct
and it's not cheap. It would be quite difficult to sell a piece and
then tell the lady she can only wear it at midnight.....
Cheers, Hans Meevis