Identification of possible silver & malachite Swiss cufflinks

[onice]

Hello, everyone, I'm a newcomer on this site. I'm looking for some help and support to identify the origin of cufflinks that have been given to me.
They are made of silver 800 and malachite. But it seems that the "800" has been "restamped" over a "835".
They were in a box with the name "GIL Genêve" written inside. There is a mark, maybe a maker's mark I haven't been able to identify (a "T" in a "triangle").

Picture of one cufflink : https://imgur.com/a/tJkZFXF
Maker's mark ? : https://imgur.com/a/pEq1wfb
Silver mark : https://imgur.com/a/fhwb5GX

Thanks a lot in advance for your support ! and don't hesitate to provide me with advices !

[dognose]

Hi,

Welcome to the Forum.

Please embed your images.

Trev.

[onice]

With embedded pictures !

Picture of one cufflink :


Maker's mark ?:


Silver mark: