Sea opal is a clear dreamy milky white with undertones of pale blue or yellow depending on your light source. I see more yellow in bright sun, and more blue the rest of the time. Sea opal is the name of the color. There's no actual gemstone called sea opal. They also go by the trade name "opalite", and are made of glass. The puffed heart is 12mm. Hearts sometimes have a few little bubbles in the glass. Accents are white cultured freshwater pearl, and Austrian crystal. All silver is sterling. 1-1/2" (40mm) long from the top of the shepherd hooks. Gift-ready in either an organza bag (default) or gift box upon request. Packaging styles change with availability.