Looks like unakite not jade.
If you choose brown,how many choices will you get.............. https://www.gemselect.com/other-info/brown-gemstones.php
Scientist were arguing about it more than a hundred years ago ........
The frame would need to be heated to safely remove the lenses.Thin is relative,I think the minimum thickness after the mid 60's in the U.S. was...
If you could check the center thickness of the lenses it might help with a time frame.
The shield looks like Colonial knives,but other companies may have used it also.
Looks like a Chinese soapstone or other stone carving........ https://www.antiquers.com/threads/chinese-soapstone-carving-age.2418/
Could be,is the vase magnetic?
What is "shakudo work"?
Size? Doubt it is shakudo.
If it was made in the U.S. there is no requirement that metal be marked for content.
Glass and gemstones were used. https://www.abrandtandson.com/products/1-victorian-15kt-rock-quartz-crystal-carved-intaglio-spinner-fob...
Posted a couple of hours ago and is already on Google images.
There is nothing distinct about it for any real answer, 3 pages of a similar piece with patch.......
Black chalcedony does exist naturally but it is rare..... https://www.jckonline.com/magazine-article/black-chalcedony/
When was the other one with a similar patch and didn't hold water?3 months/6months ago? Doesn't look like they did a good job of trying to solder...
Sardonyx is brown/reddish brown with white layers and onyx is black with white layers......
Guess you didn't know that quartz can have bubbles in it.
Shine a light thru the bottom of the amethyst and see what's inside.
That would make the "EP" upside down on the shield.I have never seen anything inside a shield being upside down,maybe it isn't an "EP".
Separate names with a comma.
