Is French perfume diluted to sell to stores in America?  I am
wondering if pure perfume (NOT Eau de Parfum, etc.) made in France,
like SHALIMAR by Guerlain, is better smelling and less diluted if you
get it in France.
Also,  How do I go about ordering straight from Guerlain?

http://www.guerlain.com/index.asp?page=gbasp/boutiques/&logo=1

Generally, no.  The traditional strengths are: perfume (or parfum) 15
- 25%, eau de perfume 8 - 15%, eau de toilette 4 - 10%, and eau de
cologne 2 - 4%, with the later two being successively weaker than the
full strength perfume.  Manufacturing is strictly controlled from
their factories -- regardless of destination.  If a weaker "version"
is needed for a certain market, usually they develop a separate brand
name for it.  This strategy preserves the integrity of the original
product.  However, there is a black market that illegally uses the
factory-issued packaging with the liquid either diluted or replaced.

On a closely related aspect, there are the "notes."  The high note is
that part of the fragrance smelled first but lasts only a short while.
 The heart note is the part that mixes with a body's chemicals and
last for a few hours.  The base note can last for many hours.