It is wrong to wear diamonds before luncheon, except on one’s marriage rings. Before, after, and during breakfast, luncheon and dinner, it is vulgar to wear a mixture of colored precious stones. It is always a comfort to know that so many things one can’t afford to do anyway are vulgar.

In the column Judith Martin answers etiquette questions contributed by her readers and writes short essays on problems of manners or clarifies the essential qualities of politeness.

Judith Martin (née Perlman born September 13 1938) better known by the pen name Miss Manners is an American journalist author and etiquette authority.