I created new servitors (fae and ess) about a month ago in fossilized amonites and the connection was always clear, no matter how far I was from the amonites. I never took them away from their shelf.
Although, last week, I asked them to move into more subtle homes : some sort of energy orbs/pocket dimensions/whatever that would float around me. They liked the idea, created their energy bubbles however they wanted to and moved in. I checked with them at the time, and everything was ok. I checked again today, asking how they were feeling about their new homes, and I felt deep peace and comfort
Advantages of this : such a home is always with me, can’t be lost, probably can go wherever if need be, can be modified however the servitors want to, and I don’t have to wear any item.
Disadvantages : no physical item to help focus when communicating with the servitors, or to remind us of a forgotten servitor (one can always make a list, though ).