An unapplicable question of taste

I was recently informed that etiquette dictates a lady never boast more than thirteen pieces of flair at the dinner table, lest she be considered some sort of Bohemian Gypsy outcast. Even this total seems a little conspicuous- two earrings, two rings, two bracelets, a watch. Save a row of silver buttons pinning me into my blouse, I cannot think of six more embellishments I'd want on my person, unless I was attempting to attract raccoons. What's left is the question of the minimum. If she doesn't sparkle from each angle of the table, is there something of her ladyhood lost or muted? Is there, attached to this rule, an unspoken ideal number we are too polite to mention? Tell me, is this number set a little high to accommodate some distinguished queen with her dozen diamond necklace? Or purposely low, like a dare. Caroline, my darling, in the many books you've read on such subjects, are you the one to tell me how to ice myself appropriately should an invitation of significance come my way?