Buy it:
http://www.artofadornment.ca/catalog/product_info.php/products_id/649
Nocturne Victorian Filigree Cuff Button Covers
Sold in pairs. Ideal for the look of cufflinks on regular button-cuff shirts and blouses (also great for covering mandarin collar buttons). Gorgeous silvertone metalized acrylic ornaments with a dark antiqued silver (almost gunmetal) finish, a glossy black enamel diamond shaped centre and elegant filigree patterned scalloped edge. Made from vintage 1980's buttons, mounted on silvertone nickel-plated hinged button covers. Simply pry open the hinge, slip the notched half over a button, and clip shut. Will cover almost any button up to about 15mm (5/8 inch) diameter.
Dimensions: 3/4" (20mm) diameter