You are referring to the beloved Lola & Ruby Moon guides!
Ruby has historically symbolized passion, protection, and vitality. By pairing it with lunar motifs, Ruby Moon introduces a dimension of intuition and cyclical renewal. Owners of Ruby Moon pieces often describe them as "talismans for courage during dark times." The combination is particularly popular among those born in July (ruby’s birthstone) or under a Cancer or Scorpio moon sign. lola pearl and ruby moon
The final answer is:
The relationship between Ruby Moon and Spinel Sun is designed to mirror, yet contrast, the relationship between Keroberos (Kero) and Yue. You are referring to the beloved Lola & Ruby Moon guides
Act I – Discovery