What brand is this?

So this necklace was my great grandmother’s, and I’m wondering what the brand is. On the back there is some sort of logo and text. The text is basically rubbed off by now. She got it in Israel and I believe that it has genuine Eilat stone in it. If anyone can ID the brand, it would be great.
Thinking the logo might be Hebrew letters, I matched all Hebrew letters against it and searched google for matching jewelers in Israel, but came out empty. My guess is that the jeweler who made it wasn't part of any bigger brand and did not leave a successor. If that's the case, then finding who made it would be a job for a historian. Sorry :confused: