Ayn Rand developed the idea that a concept is the combination of two similar characteristics with measurement omitted.
The word diversity is what is known as an anti concept. It is the combination of two disimilar characteristics into a pseudo idea. Afterall, what is diversity but the joining of different things together?
The Objectivists regard such words as diversity as trash words, related in ridiculousness to such words as extremism. Extremism is another trash word like diversity and I think it was first used to smear Barry Goldwater and his supporters.
IMHO Ayn Rand's measurement omission as the major component of concept formation is her greatest accomplishment -- not her selfishness stuff. I wish some mainstream philosophers would right more about Ayn Rands measurement omission as regards concept formation.