Hello,
Thank you all. Yes I found it.
Sorry for not including the main photo but another photo. In the main photo, it was worn on the neck.
I found this website:
https://www.identifymedals.com/database/medals-by-period/pre-ww1-medals/the-order-of-saint-stanislaus
1st class
It is worn on a moiré red ribbon, the breadth of two and a half inches, double white stripes at the borders, worn over the right shoulder with the star on the left side of the chest.
2nd class
Cross of the same form, as for the first class, but of lesser magnitude, worn around the neck, on a ribbon with a width of one or two inches.
3rd class
Cross of the same form as the first two classes but worn in the buttonhole on the same ribbon with a width of five-eighths inches.
According to this website the decoration is Second-class.
Thanks again
Demir