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!
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.See Also: