Mr. Warren Buffett
Berkshire Hathaway Inc.
3555 Farnam Street
Omaha, NE 68131
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Softer and more fragile than other gemstones, opal requires special care when worn. Opals have high water content and tend to dry out causing them to craze. Avoid storing your opals in airtight areas, such as a safety deposit box. The dry climate tends to accelerate the drying of an opal. Additionally, heat and sudden temperature changes may also cause opals to crack, so they should not be put into an ultrasonic or steam cleaner. Should your opal become soiled, you should clean it with a soft cloth. It is important to have your jewelry professionally cleaned and checked three to four times a year. When not worn, opal jewelry should be stored in a jewelry box lined with soft fabric.