Condensed from my Missions Course (2008).
What did the white stone mean?
The person who overcomes is promised a white stone and written on it a new name. Jacob started out as a supplanter but overcame his past and received a new name, because names have meanings and a change of names can reflect a change of character.
(Thus Abram became Abraham, Sarai became Sarah, Jacob became Israel, Simon became Peter and Saul became Paul.)
So what did the white stone, on which the new name was to be written, signify?
In the jury system of the day, a stone was cast in an urn as a vote – black for guilty and white for acquittal.
The reference is (in Revelation 2:17) and the jury system is historical.
For any questions feel free to e-mail me.
A blessed week-end to all!