Light Bicycle. Their WR series are 25mm internal, 32mm external. Come in a variety of depths.
Aero. Light. Customizable. Reasonably priced. Very high quality. They are legit.
Might have to wait a bit though. Probably 2-3 month lead time right now with Chinese New Year.
I was going to get Light Bicycle but was turned off by their very high shipping costs, seems like they’re padding their margins. I ended up going with Farsports, which were cheaper as shipping is included, and quality is excellent, I’m sure comparable to LB. Build quality is far superior to a no-name Chinese carbon wheel I bought a while ago, rim build quality is comparable to my Zipp Firecrest tri race wheels and overall build quality is actually better, the spoke tension on the Zipps was not very even. Wait time was about a month and a half.
No way would I spend $1800-2400 on wheels for gravel. They’ll get scratched up and the performance advantage over less expensive wheels is minimal to nonexistent. And even though I went with a set of carbon wheels (mostly for the marginal gain of lighter weight) I think there’s something to be said for buying decent alloy mid-weight wheels and having a couple of sets with different tires for different riding conditions. Or if you’re using your gravel bike as a quiver killer, a mid-range alloy set of wheels for gravel and a deeper carbon set for road.