Can Anyone Share Their Experience with Antique Cut Jewelry?

I'm looking for a quality online jewelry store for an upcoming engagement and recently discovered Antiquecut. Their website has a wide range of engagement rings, wedding bands, loose diamonds, earrings, necklaces, and other fine jewelry in both lab-grown and natural diamond options. I also noticed they offer custom-made jewelry, which is something I'm considering. The designs look impressive, but I'd like to hear from people who have actually purchased from them. How was the overall experience from ordering to delivery? Was the diamond quality as expected? Did the ring sizing, craftsmanship, and finish meet your expectations? If you contacted their customer support, were they responsive and helpful throughout the process?