Carissima Gold Women's 9 ct 3 Colour Gold Lucky Rings Chain Necklace of Length 41 cm/16 inch

Is there a 375 stamp on it? Thanks.

Does it say that's it three different golds

Are the rings "smooth" or are they embossed with and image? Can't tell from photo if embossed or if it is just a reflection on the ring.

please advise on ring diameter please