The brooch is marked "REGd 925" and has a little stamp, in addition, "101 BY/W" is very lightly single line scratched after the marks. The stamp is very hard to Photograph unfortunately, will try to come up with something better.
The REGd, is REG with an underlined capital D.
The stones will be identified later this week, they are slightly irregular in terms of cut, sparkle is good, and there are slight colour differences between them. This may indicate that they are diamonds, (though very small ones).
The use of a compact camera and flash has wiped any colour from the brooch. The image is poor quality and has been sharpened. The brooch is uncleaned.
Age is unknown. Was left to a woman by her aunt whom passed away. The grandmother of the woman was said to have given it to her aunt.
Believed to be UK in origin.
The brooch is 26mm across.
No solder or repair is to be seen.
Thanks again!