[Master Board] Surface hardening of 990 gold

Jewelry Discussion
1

New posting to The Gem and Jewelry Master Board BBS
https://www.ganoksin.com/master_board/

Hi everyone,

Has anyone tried surface hardening of 990 gold. Would like to have more
info in this regard. Is it sufficient if 99% of Gold is present or we need
to push it up further by another 0.3%. In this case we will have about
0.5% to play around with.

Veterans share your views !!!

Pathy

email : pathyr@hotmail.com

2

Hello Pathy, Have had little success with hardening higher karats than 20k
[.833]. This will work harden in any of the traditional ways. I would also
like to learn a way to handle higher karats. Some heavy metals as alloy
might work, but they are so dangerous, I think I would leave them alone.
Take care. Tom Arnold

3

Has anyone tried surface hardening of 990 gold. Would like to have
more info in this regard. Is it sufficient if 99of Gold is present or
we need to push it up further by another 0.3. In this case we will
have about 0.5 to play around with.

there is a manufacturer who impregnates the near pure gold
surface with diamond to make it more scratch resistant, but i
don’t know (and doubt) that it makes the whole article more bend
resistant. this technology is at least 5 years old.

in a recent jck, in the ‘new products’ area, there is an
introduction of a new, virtually pure gold alloy that is touted
as having the wearability of 18k. the manufacturer puts a minute
amount of tungstun ( i think, don’t crucify me if i’m wrong ). i
believe where the technology lies is how to get the ‘alloy’ to be
homogeneous.

best regards,

geo fox

4

Didn’t Sumitomo just patent a new process recently? I seem to
recall that they were giving away samples for the spot price of
gold either this year or last…(I think it was Sumitomo. It was
a Japanese company. Someone forwarded the article to me as a
clipping from a Japanese newspaper.)

Has anyone worked with it yet? Sounds intriguing to me, if it’s
reworkable. I’d love to be able to satisfy the craving some
people have for 24k without sacrificing durability.

kat tanaka
kht@vincent-tanaka.com