My Father died last August 2010 without signing his will.
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That is an interesting set of facts. If your younger sister in possession of the rings is not going to cooperate, you are going to have to go to court (or figure out what she wants in exchange) in order to get them (to give to your daughter). In court, you might not win, but it would be an interesting case. Trouble is, you would have to pay thousands to a lawyer.
If your sisters are willing to cooperate, the "right thing to do" is that each of the three of you receive an equal 1/3 of you mother's estate. You are going to have to collect the property, assess the value of all of it (either agree, or have it appraised) and then divide it in such a way that everyone is satisfied they're receiving their 1/3 share. Presumably you'll want the rings to be part of your share, so you can give them to your daughter.
Unless your sisters are willing to acknowledge your mother's intent to give the rings to YOUR daughter as a separate gift, they are going to have to come out of your 1/3 share, rather than being separated from the pile of things before the three part division is made.