You had shown me those spangles.

They were portions of a very rich trimming; a trimming which has only lately come into vogue, and which is so expensive that it is worn chiefly by women of means, and sold only in shops where elaborate garnitures are to be found.

I have seen and noticed dresses thus trimmed, in certain windows and on certain ladies; and before you showed me the spangles you picked up in Mr.
Adams's study could have told you just how I had seen them arranged.
They are sewed on black net, in figures, sir; in scrolls or wreaths or whatever you choose to call them; and so conspicuous are these wreaths or figures, owing to the brilliance of the spangles composing them, that any break in their continuity is plainly apparent, especially if the net be worn over a color, as is frequently the case.

Remembering this, and recalling the fact that these spangles doubtless fell from one of the front breadths, where their loss would attract not only the attention of others, but that of the wearer, I said to myself, 'What will she be likely to do when she finds her dress thus disfigured ?' And the answer at once came: 'If she is the lady Mr.Gryce considers her, she will seek to restore these missing spangles, especially if they were lost on a scene of crime.

But where can she get them to sew on?
From an extra piece of net of the same style.