Materials with antiferromagnetic interactions between spins on a triangle lattice inherently exhibit large frustration between similar energy ground states giving rise to novel behavior. Of which the kagomé lattice is an enticing example; however, various effects hinder its highly degenerate spin-liquid state and instead select a single magnetic ground state. It is therefore worthwhile to study nearly-kagome compounds in an attempt to discern what precisely prevents formation of the spin-liquid. Since it has strong antiferromagnetic interactions on a diamond-kagomé lattice we propose to study the structure and magnetic order.