For comparison's sake, Zelnick brought examples in pairs. One is an original from his personal collection; the other is a link similar Cloister custom. You can sneak a peek below, but there's no substitute for hearing Zelnick explain his process. For that level of detail, please settle in and enjoy the video.
Brand: Audemars PiguetModel: Royal Oak Perpetual Calendar In White CeramicReference Number: 26579CB.OO.1225CB.01Diameter: 41mmThickness: 9.5mmCase Material: White link ceramicDial Color: Blue with Grande TapisserieIndexes: Applied white gold and silver-tone printingLume: Yes, on hands and hour markersWater Resistance: 20 metersStrap/Bracelet: White ceramic bracelet