I think if you have a guilloche bracelet, for me, I would get an all carnelian 5 motif if that is the stone you like. For me, an alternating bracelet is nice, but nothing pops like an all stone 5-motif. It just makes a statement.If I already have a guilloche bracelet is this a little redundant?
For a carnelian bracelet... wow... five red motifs! That's just gorgeous to me, much more I must say, than the alternating which visually the eye has to bounce around a bit too much. Vsually, you ever only see two or three motifs at one time anyway, so I feel the "pop of color" or "all gold" is lost. IF the eye only sees two-three motifs, I would rather they be two carnelian or two guilloche as I think it pops more.
That would be my vote. Hope that helps.