Your English is perfect my friend... greetings from Canada!
I would like to know if your ring has any makers marks inside the band, if these are present, then you'll be able to date it that way?
I assume it's made of gold, but what karat? A higher karat could mean that it has some age to it.
The ring shows minimal wear and it doesn't look like it's ever been buried for a period of time.
Stylistically, I'd say it dates anywhere from the 1960s to the present day.