Quote Originally Posted by kburr View Post
1- are there other ways of saying that, that sound more fluent?
You can use a possessive adjective(притяжательное прилагательное) instead of a noun in genitive.

All mean the same:
"Это кольцо моей мамы"
"Это кольцо мамино"
"Это мамино кольцо"


But only a limited set of possessive adjectives are normaly used in such sentences. For example: although сестринский and сестрин are possessive adjectives from сестра, "Это сестринское кольцо" and "Это сестрино кольцо" both sound odd for me.
So I recommend you to avoid possessive adjectives until you absolutely sure that it's widely used.