The only concern is that the diamond is a bit contrasty. As you can see, the ASET has alot of blues and this is reflected in the photo (dark ring under the table).
If the store has a window, take the diamond there and assess, with the diamond facing the window/outside and your back against the window. Avoid direct sunlight. When the diamond is close to you, you should see the darkness in the actual photo. Increase the viewing distance and tilt the diamond 5 degrees back and forth. See if the darkness goes away (it will not dissapear completely) and the appearance becomes more pleasing.
Do you have a link to the stone on hold so we can see it moving? People dont like to have to download stuff on their computers.
I think its too dark under the table but seeing it in motion might change my mind.