A fine example of a plique-a-jour button, all of which are uncommon (see Note 1, below), featuring translucent greenish-blue enamel in a gold metal surround and cells. Excellent condition with no issues. The color of the enamel is actually deeper than shown in the main photo. The diameter is 13/16".
1. Plique-à-jour (French for "letting in daylight") is a vitreous enamelling technique where the enamel is applied in cells, similar to cloisonné, but with no backing in the final product, so light can shine through the transparent or translucent enamel. It is in its effect a miniature version of stained-glass and is considered very challenging technically, highly time consuming, and with a high failure rate.
2. We collected buttons for many years, but have decided to sell our collection. The buttons shown on our site represent but a small sample on what we have, so please do not hesitate to ask if you are looking for a particular type.