I don't know if this link will help, but I found some hematite beads shaped this way at:
The hematite at this web site is silver in color but it could easily be grey, black or gun-metal in color.
I haven't been able to find any connection, but I suspect that if your beads are hematite, there is some connection between Kenyan myth or ritual, hematite and marriage. You might try emailing the Kenyan Embassy in Washington D.C. (email@example.com) telling them your story and posing your questions to them (especially, whether there is in Kenya any particular significance of hematite for marriage). Hope this helps.