These days definitely unbranded. I went through a HUGE Tiffany, Cartier, Bvlgari, and VCA period. I have since sold everything except for a few Tiffany gold Elsa Peretti bean pieces and the gold Tiffany Paloma graffiti X earrings. I now put my money toward classic, timeless pieces from local jewelers: high-quality solitaire diamond pendant; diamond channel set eternity band; diamond, emerald, ruby, and sapphire studs; a sapphire band; a ruby solitaire in white gold; etc. I also bought some low-key pieces from a brand called Gabriel and Co. that I discovered at a local jeweler. I'm enjoying discovering jewelry beyond JUC, serpenti, Alhambra, Love, and the like and have had no regrets.
Your collection sounds beautiful! For simple, stone-centred pieces, you really can't go wrong with a great local jeweller. The issue for me is trying to find a jeweller who will actually customise and make pieces, rather than just offering a set catalogue of products that they order in.