Featured Question on scarab pendant. Back has "Solid Bronze" and "TM"

This was a quick purchase at this recent sale, "As Is" was noted, but for $4, so grabbed it. The "As Is" is that someone soldered a hook on the top (this under the felt pad). I haven't really examined it to see the repair, but pulled back the felt and saw new solder. May not have been the greatest purchase, but is a pretty bold piece and actually looks nice on. Thinking 1970's maybe?

The back has the wording "Solid Bronze" and beneath looks like "TM". Anything you can tell me appreciated. Thanks.

 

I would have snatched it up too. The colors are beautiful.

 

Just realized, could TM be for trademark?

 

What is this appearance of "crushed stone" technique called, please?

 

crushed stone/chip inlay

 

I think 1970s a good guess. Here's what Kenneth Jay Lane, a high end costume jewelry designer, was doing then.

Debora

 

Thank you @Hollyblue , is it set into a clear polymer or what?

 

Epoxy resins