You see these swirling pink glasses, bowls, plates, tumblers, etc. frequently.  My husband picked up a number of these pieces at a going-out-of-business sale.  This is the 3 7/8 inch cordial.

According to an entry on Wikipedia, Cristal d’Arques is a brand of Arc International, a privately held, by the Durand family, company in France.  According to the article, Arc international is the leading international manufacturer of glass and crystal.  Other frequently seen brands include Luminarc and Arcoroc.

I don’t believe that this pattern is in production any longer, and I am guessing this stem has a 1970s/1980s date.