I have a couple of thoughts, some have been mentioned. I really like the design, but I’m pretty detail oriented. So, forgive me if I overwhelm…
~ Milgrain. Don’t have them cast the milgrain. You want it done by hand. Like this. Fine and delicate using a small milgrain wheel done by hand.
~I love bezels, but not all old cut stones love them. A lot of old stones need light to enter from the girdle or them die. Your pear is so pretty, I’d hesitate if I was not sure. You can have the jeweler or yourself make a foil packet around the girdle and see what happens. It looks like you bought the stone from MyDiamondZone/IvyRoseVintage. They know old cuts. Ask their opinion too.
~If you want a flush wedding band, the petals need to be altered. The bridge under the head needs to be continuous circle. You may need a donut, like the rose gold ring. The trick will be to have the shoulder flare, so it does not tip the wedding band away from the ring. If you look at this picture, you can see the two rings are flush. If the shoulder of the ering is wider at the top, it will push the wedding band away at the top. So, you need that flare to occur over the top of the wedding band OR keep the flare within the width of the shank. If you look at the last picture below, CVB keeps the detail the same width as the band, flare a bit at the top (over a band) and then points it.
~The amount of metal to hold the girdle (the collar that wraps around the girdle) is too tall in your CAD. This ring below is a 1.3 carat OEC, so your bezel should be similar. The CAD shows about 1/3 the height of the gallery as bezel. The ring below is less than 1/4 the height. I’d send this picture to show the gallery and shank.
~The wraps (blue outline, above) will be rubbed away over time, as the band rubs. Rather than lose this feature, have a look at the CVB design at the end of this. The “wraps” are created by removing metal, not adding it. So, they won’t be lost as quickly.
~The shoulder epaulet detail seems unresolved. The diamonds don’t relate to the petals or other elements of the ring. Your epaulets are diamond shaped, but your petals are rounded. If you look at the rose gold ring above, it has more diamond-shaped petals. the white gold ring with the pink arrow has rounded petals. To keep the design connected, you need to either go rounded or diamonds. For an old pear, I’d keep the petals rounded (and delicate). Then, re-think the shoulder to keep the rounded and flowing feeling.
If you go with a baguette, which is lovely, you can keep detail in the shank (see Pear bezel below)
Detail in shoulder created by placement of stones and some metal work. This does not have retain a flare, but you get a lot of interest without changing the overall shape of the shank. This would work with the diamond gallery shapes.
You can keep the shank interesting by adding a baguette and a diamond-shaped (round stone) under that. This make is much easier to make a flush set, while keeping the detail you want.