I need help please?!?!

[AwesomeSauce]

So I found this ring. I tested it and it is silver, sterling, even though it is not marked with"Sterling" or ".925"....It does have a hallmark though. I have some pictures, can someone please help me find out what the hallmark stands for, the artist, is it old, and also what kind of gem/stone/rock is on it please? Here are a couple of pictures....Thank you so very much.

 

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[G.A.P.metal]

Online Encyclopedia of Silver Marks, Hallmarks & Makers' Marks
Mystery Marks -- Silver Hallmarks and Makers' Marks

 

[trapperart]

Congrats

 

[Cosmo3]

Nice find mate.

 

[Geochem]

Looks very clean. I like this style of ring. Enjoy!

 

[tomsneck]

Beauty. Love finding rings. Good luck on the Id

 

[Argentium]

Really nice looking ring ! I think the stone is an agate (a variety of quartz) The ring is not very old likely made in the last 20 years . Great Find !

 

[Garrett424]

Looks relatively modern. Can't help you on the mark but she's a beauty...

 

[Professor of Engineering]

Congratualtions on the beautiful ring find!