I feel one can't have too many knit cardigans. They're very packable (rolled), in luggage or purse, classic enough to be versatile (casual, work and dressy), and useful for every season--indoors in winter, under a blazer in fall, outdoors in spring, and summer evenings. Most knit cardigans have enough give to allow for weight fluctuations and varying thickness of layering garments.
The remaining questions are whether you like the shape (does it suit your bust, torso length?) and the color.
It's hard to say from a few phone photos--if you like cool mid-tones (magenta, rose, which you're wearing in your profile photo)--turquoise might work well for you, but if your skin is quite olive-tone, turquoise might be difficult.
It'd be best to try it on in a dressing room with only a bra beneath -- and try to cover it as you judge the effect. Do your features (eyes, lips) seem to recede, look balanced, or be emphasized? Would you feel comfortable wearing this color alone as a swimsuit?
As an accent piece, it isn't essential the color be perfect for your complexion--it can be balanced by under-pieces, scarves and accessories, but it might determine how often you reach for the cardigan when not outfit-planning -- and how good of an investment the piece will be for you, in the end.
It is good to know what colors look good on you, overall. The answer to this question can make shopping worlds easier.
Good luck!
