I am looking for contact information for an Italian jewelry designer
named Monica Rossi - her jewelry line is called Anaconda and it is
sold at Barney's in the US. I have found several "monica Rossi's" but
none that seem to be her.

Hey Jude -- tra la la la (sorry, couldn't help myself) 
 
A search for Monica Rossi resulted in a lot of Italian language pages,
and except for restaurant menus and my high school Latin classes, my
Italian comprehension is pretty limited. However, I tried the 'English
pages, only' option which gave me very few results, but did lead me to
this:
 
Anaconda 
Via Bergamini, 7  
Milano 20122 
+39 0258303668 
Located in Downtown. 
 
"This jewellery shop sells gold and silver designed and chosen by
Monica Rossi, sandblasted into different colours with stones,
quartzes, porcelain, glass and silk."
 
Milan, Italy Hotel Reservations and City Guides - Rightcity.com 
http://www.rightcity.com/detail/Milan/_/Italy/20363/ 
 
___________ 
 
And... 
 
"A very particular jewellers, even in its architecture. 
 
Unique materials, hard and precious stones, satin gold and pearls, are
used to make exclusive pieces, harmonies of colour and shape.
 
But we can also find porcelaine, glass, silk, always combined with the
particular tastes of Monica Rossi.
 
Prices range from L.400,000 for the cheapest item to ten million lire
for the most expensive. Not for everyone, and not simply due to the
price."
 
This is from another page with the same root URL as the first
reference:
http://www.rightcity.com/detail/Milan/_/Italy/91681/  
 
If no 'official' answer is forthcoming, maybe you could contact the
Anaconda store for further assistance?
 
Ciao, 
revbrenda1st

Hey Jude -- tra la la la (sorry, couldn't help myself)

A search for Monica Rossi resulted in a lot of Italian language pages,
and except for restaurant menus and my high school Latin classes, my
Italian comprehension is pretty limited. However, I tried the 'English
pages, only' option which gave me very few results, but did lead me to
this:

Anaconda
Via Bergamini, 7 
Milano 20122
+39 0258303668
Located in Downtown.

"This jewellery shop sells gold and silver designed and chosen by
Monica Rossi, sandblasted into different colours with stones,
quartzes, porcelain, glass and silk."

Milan, Italy Hotel Reservations and City Guides - Rightcity.com
http://www.rightcity.com/detail/Milan/_/Italy/20363/

___________

And...

"A very particular jewellers, even in its architecture.

Unique materials, hard and precious stones, satin gold and pearls, are
used to make exclusive pieces, harmonies of colour and shape.

But we can also find porcelaine, glass, silk, always combined with the
particular tastes of Monica Rossi.

Prices range from L.400,000 for the cheapest item to ten million lire
for the most expensive. Not for everyone, and not simply due to the
price."

This is from another page with the same root URL as the first
reference:
http://www.rightcity.com/detail/Milan/_/Italy/91681/ 

If no 'official' answer is forthcoming, maybe you could contact the
Anaconda store for further assistance?

Ciao,
revbrenda1st