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Platinum Ring has a black mark - Please help me understand what this is

UYU35Z

Rough_Rock
Joined
Nov 7, 2019
Messages
3
Hello, I just received my engagement ring today and noticed a black mark on the inside of the rings' shank.

It is made of Platinum Cobalt (Pt950 alloy) and was casted.

Other than aesthetics, is this a defect I should be concerned about? I rather it not be there, but if my future fiancee is wearing it - it won't show anyways. I am more-so concerned whether or not it poses a structural issue or worse.

Thanks in advance for your analysis and comments.

Here's the album link:
 

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Bron357

Ideal_Rock
Premium
Joined
Jan 22, 2014
Messages
3,588
It’s probably a spot of tarnish not removed after manufacture. You should be able to remove it with a polishing cloth for Silver. Otherwise return it to the jeweller you purchased it from and ask them to clean it better!
 

UYU35Z

Rough_Rock
Joined
Nov 7, 2019
Messages
3
It’s probably a spot of tarnish not removed after manufacture. You should be able to remove it with a polishing cloth for Silver. Otherwise return it to the jeweller you purchased it from and ask them to clean it better!
I thought platinum is not supposed to tarnish? And would a microfiber cloth work? or only a polishing cloth would work for this kind of thing if it is indeed tarnish?

Thanks for your response.
 

Bron357

Ideal_Rock
Premium
Joined
Jan 22, 2014
Messages
3,588
Did a bit more reading. It could be a “spot” of other metal that has inadvertently fused to the Platinium while it was worked on. Apparently you have to use Tungsten rather than steel holders / wire as they can transfer onto the Platinium at the high working temperature.
 

bludiva

Brilliant_Rock
Premium
Joined
Sep 23, 2017
Messages
1,943
The jeweler who made the ring should be able to buff that out
 

UYU35Z

Rough_Rock
Joined
Nov 7, 2019
Messages
3
Hi, thanks for responding to my thread Bron357 and bludiva!

Turns out it was a bit of polishing compound left behind, I was able to remove it with ease using a cloth :dance:! Very happy my concern of porosity/pits/etc defects was not an actuality whew*
 
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