For me, I want a nice "jewelry collection"; I don't necessary just want a nice "VCA collection."
It's a subtle but important difference to me. As an example, I am sure there are people who only collect Alhambra, and it works for them. For me, I don't want that same four leaf clover look over and over again. I want a diverse jewelry collection with diamonds, pearls, colored gemstones, artistic pieces. This means having the same Alhambra set in 5 different stones is not something I am interested in doing.
I wear all my jewelry regularly, I do not distinguish between jewelry for casual, business, or formal attire. I wear my Lotus ring with shorts, a suit, as well as a cocktail dress. The same goes for a 20 motif, a pearl set, an emerald set, etc. Because I rotate regularly, if all I had was Alhambra, I would feel it's the same look all the time, albeit in different colors. My jewelry collection would be mostly the same, nothing special. You see so often much of the same thing, therefore you see nothing. For me, I love the excitement of having different pieces, each unique, but all beautiful in their own way.
This also means VCA is not the only brand I buy. Hence after I finish with a few more VCA pieces that I truly love, I am ready to move on. How do I know you ask? My gut tells me I am close to finishing because when I surf VCA online these days, it's no longer "wow, I love this piece." It is now more "oh, this could be a nice addition." The "nice addition" feeling is not the same as the "I love this" feeling. For me, jewelry is too expensive to just buy and pile on "nice addition" pieces that are more or less the same look. I don't need a ton of VCA pieces and definitely do not collect for the sake of collecting. I only want the pieces I truly love, and I feel I am getting there.
I hope that helps.