This is a vintage Blue Carnival Iridescent Glass Tealight Candle Holder. The shape is a Dragonfly.
It is about 3 1/2 inches long by 3 3/8 inches wide by 1 inch high.
The candle hole is about 1 1/2 inches across. There are no chips or cracks. It is not marked or labeled as to who made it or when.