please help me id a mexican mark on jewelry

[FRANNEEJEWELS]

I bought a brooch/locket at a rummage sale and cant find anywhere what the marks. aIt says HECHO EN MEXICO(circular) JGG(middle of circle) D925(under JGG) U R or F (completes the circle) the top of it is made of some kind of stone I tested it for bakelite and its not.

here is a pic

[ValkyrieVixen]

Hecho en Mexico means Made in Mexico. JGG is the artisan, listed in the hallmark book but the name is unknown, I've seen the mark on a lot of tourist pieces like this. DF is for Distrito Federal aka Mexico City. The 0925 is for the silver content. These masks are most often made of glass.

[FRANNEEJEWELS]

Yeah I knew about where it was made. didnt know about the DF thanks. The JGG you have seen it? where, I never have.
I dont know if it could be glass because the mouth is a different color and so is the inside of the locket, the back of the face, has color lines going through it like stone would have, they arent cracks. When I saw this I grabbed it fast cause it was so unusual. For a dollar it was good! The only other thing is that to me i would have thought i to be some kind of New Orleanstype voodoo face not mexican..go figure!
Thanks

[FRANNEEJEWELS]

Here is a pic of the back of the brown face.
I dont know who the man is but it was in the locket when I bought it.
they arent cracks:

[ValkyrieVixen]

I can't see the stone very well but check Mahogany Obsidian. The masks are also done in Obsidian, which is a volcanic glass, although I usually only see them in black or sheen obsidian.

[FRANNEEJEWELS]

Yes it looks like it could be that indeed...Thank you so much for your help!

Now if I could only figure out when my ring was made I posted it and no one seems to know. I believe the center stone is glass...but Im sure the was its made that it would surely tell the age.

[ValkyrieVixen]

There's no eagle mark so it dates pre-1948, my guess would be not much earlier so 1940's would be good.

[FRANNEEJEWELS]

Oh I meant a ring that I posted at the same time with this pin but under 'silver jewelry-single image: help id my ring'
You think the pin is from the 40's...cool