Which two saints mentioned in the introduction used the metaphor of a precious jewel to describe Maharaj's spiritual worth?

The introduction in Chapter 0 highlights two separate instances where revered saints used the metaphor of a precious stone to describe Maharaj. The first was Gangagir Baba, who, upon first seeing Maharaj carrying water, exclaimed to the villagers, "This is purely a gem. His worth is very great." Later, similar remarks were made by Anandnath Maharaj of Akkalkot. After arriving in Shirdi, he declared, "This is a diamond. You don't know its true value." Both saints independently recognized Maharaj's immense spiritual stature and used the imagery of a gem or diamond to convey his value.