The tub is the Caribbean Corner Tub made by Jetta.

Can this Jetta Caribbean model be installed as an undermount? What edging is used here?

This tub unfortunately cannot be installed as an undermount tub. I do know that Jetta has other tub options that you are able to install as an under-mount. Please try their website at www.jettacorp.com

Thank you. I have additional questions-does the tub have a lip surrounding it? How deep is it? Our spec sheet only has a bird's eye view. Did the bullnose butt up to that edging and then get caulked?

The tub does not have a lip surrounding it. It simply drops down to the travertine deck and the silicon is used to seal it in place. the tub itself is 24" deep and the edge of the tub is about 1 1/2". The tub deck edge is a 24x24" tile that was bull-nosed and a decorative trim molding carefully placed beneath it. I hope this helps. Good luck with your project.