Charity shop find

[Fiona_1970]

I found this ring in a charity shop, I’m almost sure it’s 9ct gold but don’t know what the 10K stamp is, also would anyone have a clue of the stone? Could it be a cats eye?
All help is appreciated
Thanks in advance
Fiona

 

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[unclemac]

star sapphire

 

[Fiona_1970]

Thank you

 

[gunsil]

They do make man made star sapphire, a gemologist could tell you if natural or not. The 375 mark is 10K.

 

[xr7ator]

.416 or .417 is 10k. .375 is 9k.

 

[Fiona_1970]

Would the 10k maybe be .10k for the size of the stone?

 

[gunsil]

No, gold is karats, which is a fineness or percentage of gold. Stones are carats, which is a weight. Five carats to a gram. Sorry I messed up with the 375, I make jewelry, do know better.

 

[Fiona_1970]

Thank you

 

[islamoradamark]

Welcome to Treasurenet

 

[Red-Coat]

Welcome to Tnet.

It’s a nice ring, but I find this a little odd. I don’t immediately recognise the marks, which I suspect are relatively modern but I think this ring must have been made outside the USA but sold within it, or vice-versa… depending on whether the 10K mark was applied before or after the 375 mark.

In the US, 9K (375) purity doesn’t qualify to be sold as ‘gold’ (not since 1906 anyway) but it’s a common minimum standard in many other countries. However, in those countries with a 9K (375) standard, a 10K purity ring could only be marked as 9K. So, it could have been made and marked as 10K in the US and then re-marked at 9K (375) to align with the standards of a country outside the US where it was sold. Or, it could have been made at 9K (375) outside the US and someone has ‘upgraded’ it to 10K to meet the minimum US standard for gold. If the latter, that may or may not have been a legitimate upgrade for the mark. There can be a bit of tolerance on composition such that a ring made to a nominal minimum of 9K might just scrape into 10K.

 

[Molewacker]

The 10k mark doesn't seem right compared to the others - the 1 is wiggly, the 0 looks like it was stamped over a bad K before the other K.

 

[tokameel]

Nice pics! Welcome to T-Net.

 

[Jose The Goon]

"Fiona" Your ring could be old. A good way to authenticate if you have a real Star Sapphire is the light test. The star should "move around" in the stone as you pass light over it from different angles (or the Sun) Nice find & welcome to T-Net.
Here's a link that might help you with the Star Sapphire: https://invoguejewelry.blogspot.com/2013/09/star-sapphires-how-to-spot-fakes.html

 

[Elvis]

Sweet find!!

 

[cudamark]

Looks like a 10 stamped over another 10 that was too close to the K.