Ova Magica’s friendship system in that update shows 3 friendship levels for events, with rewards and unlocks appearing at Level 3, Level 4, and Level 5.

What that means

  • Level 3: Jade, Saphir, Charoi.
  • Level 4: Jade, Ruby, Saphir, Garnet, Lazuli, Carnelian, Jasper, Charoi, Opal, Citrine.
  • Level 5: Saphir.

Extra note

The update also says some buildings and features unlock through friendship progress, like the Beachside Eatery for Saphir and the Gold Cup Tournament once all NPC friendships reach Level 3.

TL;DR: There are 5 friendship levels in the content described there, but the update specifically lists friendship events at Levels 3, 4, and 5.