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Inert n/p is a great neutral nail polish for those who like nudes with an oompf. If you apply one coat - neither too thick nor too thin - the grey undertone will come out much better than when applied with a thick layer. With a thick layer, the color comes off much more beige. However, if you want to stick to the GP color scheme, one medium layer will give you an awesome finish that is a nude beige with hues of light grey and lavender.
The color looks very similar to the combination of Vacant l/g over Restrict l/s, i.e. a beige with nuances of lavender depending on the light. It also goes well with beige-cool-rosy-ness of Strada, especially if you go for a look that is neutral but still very fashion-forward. If you have an NW complexion, this color looks stunning as the pink undertones in your skin will complement the lavender-grey in Inert. Having said that, Inert should also look great on NC complexions if you look for a cooler nude n/p.
The texture is creamy, nor too thick or too thin, though you need to measure it correctly to get it right with one layer/stroke. It's definitely one of those n/p that people will love on the second sight, but the oomph, i.e. the grey-lavender hues, are definitely worth the money. IMO, it is equally suitable for both men and women as it is a rather gender-neutral color that does not scream n/p at all.
Finally, the design of the bottle is stunning as it looks and feels as luxurious as the compact. Mind you, it is very heavy, so you probably don't want to travel with it.