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It seems that all the things which reflect grammatical gender in languages have to do with inflectional (presumably also agglutinative) morphology, such as agreement.
But is that just coincidence, it seems the same kind of thing could be reflected in particles in an isolating language. But does it ever happen? Are there isolating/analytic languages with the concept of grammatical gender in nouns (not just natural gender in pronouns)?
The WALS1 lets you cross-classify languages based on two features. Here's a link to the cross-tabulation of "fusion of selected morphological formatives" and "sex-based and non-sex-based gender systems"2. It indicates that there are 3 languages that fall into the "exclusively isolating, sex-based gender" class and one in "exclusively isolating, non-sex-based gender." (There are mixed categories that you might wish to explore as well.) You can follow up with these languages and see if they live up to their classification – some of them could have grammatical complications that make them less than pure examples of what you are looking for.
Footnotes
1. World Atlas of Linguistic Structures
2. The feature names are admittedly a little opaque.
