There were piles of the mine rock and everyone there looked through the piles for opal, here is their website and there is a number of videos on...
The colors can be in just a layer or the entire piece of opal.This is a 3.5 inch of stone with a layer of green and mostly white we found at the...
Turquoise has been stabilized since the 1950's and the NA silversmiths use what ever is available. Here is one page which has Fritson Toledo's...
Have you looked at this site...... https://www.silvercollection.it/mexicosilvermarks.html
The dark background may be niello.
The right end of the half tube holding the "coral",bottom bar next to the bezel,probably more that I can't see in the photos.
It doesn't look like it was by a professional, sloppy soldering and no cleanup of the excess solder.
The photos aren't clear enough to see the details,the piece appears to have been made on a rolling mill and the "rubbed" area appears to be solder.
It is not a rose cut stone,they have a flat back and a pointed top.
Chip inlay,needs a real test for sterling.A magnet only tells you if the metal is ferrous or not.
A photo of the front of the piece could help.
This is what the original rhodolite looks like,discovered in the Cowee valley North Carolina.[ATTACH]
Does the mokume bracelet have a maker's mark?
Do not do anything to the rust on the handle area!!!!
Synthetic sapphires have been available since 1902.
Poorly soldered jump rings and finish,probably made by a hobbyist.
At one time the manufactures changed the font on the Sterling tools,I don't know when it happened.
A number of garnet types will glow under a UV light. Any comments welcome.
Looks like the black part is niello...... https://en.wikipedia.org/wiki/Niello
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