Need help to identify a marker's mark.

[OlyaOlya]

Hello,
Hoping someone can tell me who's marker mark this is . Thank you!

 

[bycinbyhand]

Hi there. Is there any way you can zoom in with your camera's micro feature to grab that mark better?

 

[The Vintage Vendeuse]

In case it helps...

 

[OlyaOlya]

Hi there. Is there any way you can zoom in with your camera's micro feature to grab that mark better?

Thank you for your response - really appreciated it. I apologize for the bad quality, it is just what I can take with my phone camera. I hope that it helps.

 

[bycinbyhand]

Well, ain't that hard to read?! Thanks for the really great photos, by the way. I think it says Gui and there IS a contemporary jeweler with that name though I'm not personally familiar with their stamp. Maybe someone else is?

I feel though that these are 1980s.