What to do about these family heirlooms?

Long before Mom’s health started to fail, she gave me two pieces of jewelry on two different occasions. I’ve only worn them once or twice and will probably never wear them again.

* They came from our paternal grandmother. No history on them is known past that.
* Both are in their original boxes.
* Their value is unknown.
* Mom, Dad, and the grandmother would have preferred that they were passed on to the next generation, which is what I would like to do.
* All five nieces were given pieces of Mom’s (their grandmother’s) jewelry, based upon a list she left upon her death. The three grandsons were not.
* I would prefer to pass them on now rather than later.
* I will be with most of the family next week (my brother’s two daughters won’t be there, as they have distanced themselves from us since their parents divorced over 20 years ago).

Questions for you, collective:
1. Do I pull my surviving brother and sister aside and ask for their advice?
2. What might be fair to all eight grandchildren, be it male or female?
3. Any suggestions? I would like this to be a brain-storming session.