Opal Gemstone Beads and Charms from Rings & Things: Opal has the same basic chemical composition as quartz, but usually contain 6 - 10% water! Common Opal (sometimes called opalite) does not have the flashes of light found in precious opal, but both are hydrated amorphous Silicon Dioxide. Wood Opal (or wood opalite) is a form of common opal. Its neutral, earthy colors make it an excellent option for guys -- especially guys with October birthdays. Birthstones for October include Opal, Rose Zircon and Pink Tourmaline. Bello Opal is a beautiful synthetic opal. This is a polymer-impregnated lab-grown opal (80% silica/ 20% resin), with an intense play of color, and no cracking, crazing or yellowing over time. Opalite: The term "opalite" can be confusing because sometimes it refers to common opal, and other times it refers to manmade opal. If it's not clear from an item's name, please click into the product details and we should have a clarification in the product description. Opalite glass beads have a milky center, and project a blue sheen when worn against most colors, but take on a yellowish tint when placed next to white. Read more about Opal and Opalite in the Gemstone Index.