Because it is curved, the shallowest depth is 3 3/4" in the middle and 5 7/8" at the ends.
The green ring you are seeing is the copper "rusting", or oxidizing. We just let our copper sinks age naturally and never polish them. I do regularly clean them with a soft sponge and mild cleaner and rinse thoroughly when done. I have not personally experienced this ring, however it does seem to be a part of having a copper sink. Our kitchen sinks are always turning different shades of copper, based on what we put in them - more acidic items (vinegar, tomatoes, citrus) will make them a bright copper, and then they will dull over a few days. We personally enjoy the color changes that happen.
You need to buy a drain to go with it, as well as the drain pipe. The drain that matches this sink is listed on the description page of the sink.
the width doesn't matter. I have installed mine on a depth of 22" and a length of 60"
I have it installed on a standard bathroom vanity which is 21" deep. I have a faucet mounted directly behind the sink in that space as well.
The sink I received, when installed per Sinkology specifications, measures 6" at the sides and 3 7/8" high at front center. Sink was mounted on a granite counter top in a 2 3/4" hole with a 1/8" bevel as per recommendation.
Mine is identical. Have you measured yours?
you chaffer the hole 1/8 wide 1/8 deep and use plumbers putty or rtv i used rtv dark brown
Yes, this ships with the vessel mount washer, it's a large washer than goes under the counter top.
Yes, this sink will be restocked later this month, it's a very unique and popular design. We have other oval sinks, however we don't have other's with this unique shape.