The Gemstone Industry & Laboratory Conference’s opal committee task force, formed in February, has determined disclosure guidelines for newer hydrophane opals currently on the market.
The GILC has classified the precious opal coming from the Wollo district of Ethiopia as Type 1 Precious Opal—Hyrdrophane, and recommends the following special care requirements:
- Hydrophane generally indicates a material that is absorbent when immersed in liquid.
- Keep away from cleaning agents, perfumes, oils and any liquids as they can be absorbed and may alter color and/or appearance.
- Avoid sudden and extreme temperature changes. Avoid steam and ultrasonic cleaners; clean with a soft cloth.