Is a microspore diploid?
The spores (microspores or megaspores) in gymnosperms are haploid. The microspores came from the microsporocytes which are diploids cells of the sporophyte, divided via meiosis. So the haploid microspores do mitosis and form the male gametophytes (pollen grains), containing two male gametes (sperm cell) and a generative cell which will form the pollen tube.
The process conducting to female gametes in the ovule is very similar. A megasporocyte (diploid cell of the sporophyte) via two meiosis form four megaspores (haploid). Only one megaspore is functional (the others will degenerate) and do 3 consecutive mitosis to form eight nucleus with different functions, one of them is the egg cell (female gamete). 
So the meiosis happens before the formation of the spores (actually it forms the spores) so they are haploid.
Source: R. F. Evert &amp; S. E. Eichhorn "Raven Biology of Plants"