Nothing special about the clasp,they have been commercially made for years.
The OP's is not onyx since onyx is black or banded black and white parallel layers.
Looks like a student/hobbyist piece.
Appearance can be deceiving,to me it could be a worn out historical reenactors bag. My bag is about 30 years old and little wear,but I have seen...
Where do you live? They look a little like Keokuk geodes,but geodes are found in many locations around the world.
Blue John is fluorite and would test differently.
It doesn't look like ocean jasper,ocean jasper is an orbicular "eye" jasper. Someone has been looking at too many New Age/healing sites.
Looks like ametrine,it is a step cut stone and and the design has probably been around for many years.
Could be milgrain There are different sized wheels.
It's known as bi-metal now ,at least here in the states....... http://technical-articles.hooverandstrong.com/wordpress/silver-bi-metal-sheet/
The mark on the back is an Ottoman tughra.
It could be butterfly wing.
Could have been made by anyone,is there any documentation available?
Looks like it's full of air bubbles in the photos.
https://www.vintage-sunglasses-shop.com/eyewear/14315/ray-ban-sport-metal-1992-olympic-series-bandl-usa
The top 2 I think,reproduction could be the wrong word used,more like a reissue of an older style for the 1992 Olympics in Barcelona. I remembered...
Looks like a banded agate with a quartz filled pocket.
Looks like it could be a 1992 "reproduction".................. https://www.google.com/search?client=firefox-b-1-d&q=B+%26+L+Ray+Ban+61+O+15
Pharaonic Alphabet Bracelet style.
There's no requirement to mark precious metals in the U.S.If a piece is marked a registered trademark is also required. I have sold sterling...
Separate names with a comma.
