The Crescent Moon and Opal. The crescent moon Pendent is a Talisman that has been worn as a reminder of so much. Change. A New Day. A Promise of light over Dark. This is a wax mold and engraved recess set opal and crystals. Steel keeps this piece in beautiful condition for a very long time. Waterproof. Tarnish Resistant. Hypo Allergenic.