www.925-1000.com

Plata means silver so the mark is most likely Plugo Artistica. I found several pieces with that mark but none with the maker ID'd and the mark isn't in the hallmark book, except for a mention of Plata Artistica which had no info.

Looks like the Clark & Coombs mark. The stone could be Chrysocolla, not enough patterning for Malachite.
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They had more than one mark, the f and the CDF were both for Felley.
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I've had numerous pieces by that artisan and seen many others, they seem pretty prolific, but I've never found the mark ID'd. It's often mis-attributed to Antonio Pineda but his crown has his name in it.
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That's a 28, not 2B.

It's not Goodspeed's mark. I have never seen that F-1/JF-1 style mark in the center before, it's an odd one, no clue.

The first mark is the Hopi Enterprises mark, used by more than one artisan. The Barton Wright book shows Gashwazra's mark as a gothic print stamp, not a hand made mark but maybe it's before he started using a stamp. I couldn't find any examples of his work.
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The centerpiece is glass. Plata means silver in Spanish Iguala is the town, GRO (not CRD) is for Guerrero, the state Iguala is in. MOC is the artisan who is unknown. The eagle 3 is a bit confusing since that usually indicates it's from Taxco, another town in Guerrero. It dates from 1955-1979.

It looks like Hopi Overlay work but identifying the maker will be difficult. I looked in the hallmark book and didn't find anything similar.
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It could be Peruvian since there are no Mex marks and they often use 900 silver there. I feel like I have seen that mark on Peruvian pieces before.
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Pics would help.

There is a Luis Fernando Mundo Gonzalez listed to TM-175. Most artisans who use these marks are unknowns. They are usually workers who do piecework for wholesalers. It dates 1979-present.

There is no ABM listed in the hallmark book, more artisans are unknown than known. The mark after Mexico is probably DF for Distrito Federal aka Mexico City. The 965 mark is odd, I've never seen any silver piece marked that way but it doesn't look like a mis-stamp. It dates prior to 1948.

Talleres de Los Ballesteros is a silver house started in Iguala by Jalil Majul Ballasteros but moved to Taxco in 1941 where they became a large, successful manufacturer and retailer. Most of the Los Ballesteros pieces were made by independant silversmiths operating off-site. There is no mark that fu...

It says Wohelo in Alaskan Tsimshian letters for the Camp Fire Girls motto, Work Health Love. It was awarded to girls who had earned their Firemaker's badge. It's nice this has a date on it, there are others like it that date to the late 30's. The mark seems to be related to Camp Fire Girls but I've ...

It's by Carolyn Pollack who owns the Southwest manufacturing company Relios and sells on QVC. The stones are Lapis, Turquoise, Onyx, Spiny Oyster and Malachite. It's not very old, I see it a lot, and the matching pieces.

I don't know anything more about it, I actually got all the info I gave you right here on 925-1000.com and the link to the Swedish makers site they have. :) Google didn't come up with anything on Kvoch so it may be hard to find any info. http://www.925-1000.com/Fsweden_Date_Code.html" onclick="windo...

The first mark is the maker that looks to be either GULDSMEDSATELJE MARY KVOCH or GULDSMEDSATELIER AB, second is the town which is likely Stockholm since both makers I mentioned are listed there, third is the Swedish national mark, the S is for silver and the A9 dates it to 1951.

It's not Mexican, Mex jewelry is marked Mex in some way 99.99% of the time.
It's Israeli and is made using the electroform process. I've had numerous pieces like this but finding the artisan can be very difficult. They usually had labels with the name that have long since been removed.

I have come across dozens of falsely marked Mexican bracelets, this design being the most prominent one, but there are also several others commonly faked. It's better to be safe than sorry.