Our party found a Night Hag's Heartstone.
Per the emerging consensus on this question, the Heartstone automatically expends a charge every time the holder has to make a saving throw. We would prefer to only use charges to cure disease.
The Heartstone is described as:
All night hags carry a periapt known as a heartstone, which instantly cures any disease contracted by the holder. In addition, a heartstone provides a +2 resistance bonus on all saving throws (this bonus is included in the statistics block). A night hag that loses this charm can no longer use etherealness until it can manufacture another (which takes one month). Creatures other than the hag can benefit from the heartstone’s powers, but the periapt shatters after ten uses (any disease cured or saving throw affected counts as a use) and it does not bestow etherealness to a bearer that is not a night hag. If sold, an intact heartstone brings 1,800 gp.
Is there any way to carry/port/move the stone without "holding" it to prevent it from being active for saving throws so that we can use it just for curing disease?
Note: We discovered that the DM used a 3.5e description with a 5e game - so that helps clarify some of our confusion. We have revised this question to only cover 3.5e to clarify the context of the question and be of use to others.