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I think the most attractive way to mount a Giant Clam as a sink is like the photo above
There is in fact more usable bowl area when mounted this way 
Giant Clam Sinks are  always noticed as quality natural unique decor pieces !
Sinks
  The size can be determined by using a tape measure visually so you can see the size that will fit best
 Giant clams are normally about 2/3rds the dimension in depth versus width
 Unless you have a good drill and hole saw of the diameter you need for the drain
I would suggest you mark your shell hole center and take your shell
to any shop that works with stone countertops.
They can very easily make your hole for you

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Giant Clam Shells that we sell are the very best quality available anywhere in the world
They can be found cheaper from some wholesale houses or from eBay but they will not come
with our  guaranty of quality  that we are famous for
If you do not have the tools or the experience to clean, grind, sand and buff your shell
 you will live with many imperfections for life
 
 Best Quality Guaranteed or refund back
Cleaned & polished Guaranteed delivery unbroken !