www.925-1000.com

Hello,I am new here.
I got this ring,and as interesting and mysterious as it is (love mysteries!),I cannot understand what do these hallmarks mean..?
I do know 925 is for silver,the rest is just so odd...
That looks like a cross?I have no idea...
Pretty sure you people know the answers and if you could help,that would be really nice.
Thank you.

Edit: Ring has been tested and central stone as well as surrounding stones are diamonds.
Still no clue about hallmark.
Does anyone happen to know perhaps?