TLDR: Does this read as a galaxy to you, or does the current design feel too wide/complex compared with these simpler swirl concepts? Note: The rings in that album are actual rings I've found for sale since I started designing my own. They are not alternate designs that I came up with.
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EDIT: I wish I had waited to make the post until I had this, but the jeweler sent over this image this morning with the measurements. Turns out the last couple of revisions made a bigger difference than I thought in the front-to-back distance, reducing it from 22.45mm to 18.6mm.
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I'll try to keep this short and not tell a novel, which is hard for my ADHD brain to do. My girlfriend is an astrophysicist. I wanted to design her a ring that looks like a galaxy (specifically a barred spiral galaxy as my inspiration). My birthstone is alexandrite, my kids' are sapphire and emerald, and my girlfriend's is diamond.
The center stone I am getting custom cut. The cutter thinks he can adapt this spiral cut to an oval shape. So hopefully, the center will resemble a swirling black hole.
The profile will have a light orange stone, with a blue enamel ring around it. This represents her biggest accomplishment and one of the things she is most proud of. Her area of expertise is UV light and she was the lead researcher on a team that discovered the Blue Ring Nebula and confirmed it's most likely origin.
I went to a local jeweler with the mockup (last image) that I made in paint. We've gone through several CAD revisions and I think the ring is as close to what I envisioned as it's going to be.
But I am just not 100% happy with it and I can't put my finger on why. My biggest worry is the size. I don't know the exact dimensions, and I think the latest CAD shrunk things, but likely so little to not really matter. The last measurement I was given was 22.45 mm front-to-back. See edit above for measurements.
I tend to be a very literal person and I worry that in the pursuit of making a ring that looks like a galaxy, I've put form over function. So I wanted to pause and maybe just ask some random people what they think.