Chased
Faux star,lines carved on the back of the "stone"to make it look like a star sapphire.
It's the round metal circle on the tester. Glass doesn't test the same as gemstones since it's a super cooled liquid and not a stone,the thermal...
The "CAL" is for calibrating the probe/machine before testing a stone.
It could be Hubei turquoise,but it looks like it came out of a Chinese factory.
https://www.antiquers.com/threads/posting-a-thread-and-uploading-pictures.15990/
What kind of veining?The OP's stone could be carnelian or sard ... https://sedagems.com/blog/gemstone-information/sard-sardonyx-carnelian/
Unless they are like the piles from different locations we left in areas when moving to different states.
The ring in the link looks like a lower quality Chinese made piece.
It's hard to date something when the style has been around for a hundred years.
Could be Montana agate.
Where do you live?
[ATTACH] [ATTACH] Since they could make this,I don't see them having a problem with a simple pin.
There was a reason the vast majority filigree type jewelry before WW2 was die struck and not cast.The casting process was poor and was much...
Did someone say bugs... [ATTACH]
Did you notice the bottom ring was made from 3 pieces?
If you enlarge the photo you can see that a zero was not stamped.Yes 16K(666) gold does exist and was even used by Tiffany at one time,now it is...
Since the top ring is marked 16K I don't think it came from China.
The only thing I see under the stone appears to be a solder seam. The bezel doesn't look like something a NA would make and the punched design it...
If you are removing the complete base,you can try to scratch the base with your fingernail.That will tell you if it is soapstone or a harder material.
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