Cubic zirconia (CZ) is an artificially produced gemstone that is similar to diamond. When discussing it as a "diamond replacement", I have often seen the claim that it is inferior because it scratches more easily. For example:
Unlike diamonds, CZ’s scratch and become dull and lifeless over the long term.
Cubic zirconium — Mass-produced since 1976, cubic zirconium scratches easily [...].
Now it is true that CZ is softer than diamond (8 on the Mohs hardness scale vs 10 for diamond) - however that is still harder than most other everyday substances (Quartz has 7, glass has 5.5, steel 4-7, tungsten 7.5), so it seems unlikely to scratch in everyday use.
Is it true that CZ jewelry will scratch noticeably faster in everyday use than diamonds?