More on the glass sink...
https://jsgoceana.com/product/oasis-rectangle-undermount/

the short version:
I ordered the "fawn" glass sink via Home Depot (best price I found w/ return options), despite not seeing it in person.  It should be here tomorrow.  Fingers crossed.

the long version:
I tried calling the closest supplier listed on the supplier's website and they only carried one sink, not in the colors I was considering.  I tried several other places that had no clue what I was talking about, that they didn't carry their products and even one place that was a gift store.  Keep in mind that all of them are listed on the website linked above as showroom.  I digress.  I then called the actual place in Jeannette, an hour from me.  They could 'schedule me an appointment' to see their products.  At that point, after several calls, two hours on the road was not appealing to me.

I decided to say screw it and order it from Home Depot.  Conveniently the ship to my house had free shipping and would arrive before the ship to store would!  According to their website I also have 90 days to return it to the store.  If I don't like it or don't think it matches my counter and/or wall tile it will go back and I'll order a black undermount sink from Amazon.  Done.

The next big stress:  How to properly mount the floating cabinet securely that it can handle the weight of the countertop and the sink.  Also odd is that the sink manufacturer's installation guidance indicates you're to screw these brackets into the counter top.  Into ... granite.  Uh?  The good news here is that the countertop provider will do the install of my sink and the counter, so I'd put that 'on them'.