Opal Gemstone Beads from Rings & Things.
Opal beads have the same chemical composition as quartz, but contain up to 13% water. Because of this, opal jewelry components should be protected from heat and strong light. Loss of water can cause opals to crack and/or lose iridescence. Green opal beads can be oiled to prevent dehydration. Make sure to keep your opal beads away from detergents, ultrasonic cleaners, metal polish, acids and strong solvents.
African green opal beads (aka Australian green opal and petrified green opal) come in several pretty shades of brown and green. They sometimes display black or brown dendrites (fern-like inclusions). These semiprecious beads are common opal and do not include the color "flashes" that precious opal is known for -- nevertheless, they provide eye-catching colors and patterns!