…to see the nuptial couch defrauded of its dearest pledges: and to reflect upon so many agreeable females with rich jointures, a prey to the vilest bonzes, who hide their flambeau under a bushel in an uncongenial cloister or lose their womanly bloom in the embraces of some unaccountable muskin when they might multiply the inlets of happiness, sacrificing the inestimable jewel of their sex when a hundred pretty fellows were at hand to caress, this, he assured them, made his heart weep.
There are no more uses of "inestimable" in the book.
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jewels of inestimable value
a right inestimable to them
Thomas Jefferson et al. -- The Declaration of Independence