I noticed the Japan Lexus site has more color options (I am not sure).

Check out the following link:

http://lexus.jp/models/ls/design/color_exterior.html

And look at the thrid color from the left. is that color avaliable in the US??

I don't read Japaness , so please don't ask what's the name of the color.

 

I noticed that too.

The third color from the left seems to be black sapphire.

I can't figure out which of the colors is the equivalent of smoky granite. And the black too looks different.

 

Look at the Lexus Canada website (lexus.ca), they have the same ten colors available as in Japan, rather than only eight available in USA.

What's missing in the USA is the Truffle Mica & the Glacier Frost.
The Truffle Mica will be available for the LS600hL launch Edition for the US next summer though.

 

And to think that in a few years even more colors will be offered...each of these hand-sanded etc. for a most beautiful finish.