THis is a top mount sink but u can install it as under mount like this.

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Added on September 11, 2012, 12:25 pm

Tq, it is nice to have great customers like u as well

Most of the contractors will tell you can't. Well, nothing is impossible right? His was installed by Intech Kitchen (correct me if i'm wrong) and i think others will be able to do it as well. 

u r rite, i got mine from intech kitchen and i also did post in my facebook how to undermount it. Well, if u purchased from a professional seller like us, your contractor got no way to bluff his way out of it 

https://www.facebook.com/photo.php?fbid=244...&size=676%2C600

Here's the link of my sharing on how I installed my granite sink under-mounted. The contractor brought the sink back to their factory and modified it, sticked it together with the quartz top and it's some sort like making it one piece with the top.
About cracking, i don't think it cracks easily before I get old or move to somewhere else.... Zheilwane's mum showed me a demo on its durability by dropping a solid metal ball around 4-5cm dia. on the sink...they have been doing the same demo for countless times and the sink in their showroom is still ok... 
https://forum.lowyat.net/topic/2952544/+700

Thanks for the head up bro!    I think you got a point on the wearing-off of the adhesive...
I discussed the matter with my husband and we think we better take your advise to add precaution or as an "insurance"...despite how confident was the assurance from the vendor. It might be looking good now to last for a few years, but we have no idea how will it be after like 5/6 years...
Instead of adding supporting frame, we gonna get some solid wood strips (few inches thickness), and add them along the three edges supporting the skirting strips. This is a small diy job in the plan.
Will post the pics when job is done. 

Oh, top mount and undermount sinks will have silicone confirm.

This is because for undermount, you may not notice it but if you see carefully the outer edges where the top and sink are seamlessly joined, silicone is applied there to minimize any leakage although silicone is also applied on the sink lip before mounting the top over the sink.

Usually they will use clear silicone for this and I think the type of silicone used is the higher end range in which it does not turn black or have fungus after a short while.

What I am perplexed why is it heavy to undermount a granite sink? As far as I know, maxxon has a HCE granite sink undermount with quartz countertop. Check out her house thread at post #704, page 36. Pictures are there.

There is also a guy, a home owner from another forum who DIY his own kitchen cabinet set up including sink support.