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Opal gems are delicate gemstones and require a little extra care compared to other gemstones but the uniqueness of opals are well worth the attention.

Because opals are more delicate than other gems, Mohr hardness of 5.5 to 6, opals are easily scratched or break by other stones and hard objects. Like all gemstones, opals should be kept in a soft cloth bag away from harder substances like other jewelry.

Since opals can contain 20% water, considered a "living stone", opals may become brittle due to water lost. When opals lose water, the gemstone will fracture internally, known as crazing, and the play of color of the gem will diminish greatly. For this reason, it is important to avoid high heat, direct sunlight for long periods, hot showcase lights, desert conditions, low humidity bank vaults or air tight containers, and most importantly rapid, sudden temperature changes as this may cause the opal to craze.

For example, moving from a warm house out into the freezing, snow covered backyard will cause the opal to craze. If in a very dry climate or dehumidified room, keeping opals in a tight plastic bag with a damp piece of cotton or fabric will prevent dehydration.

On the other hand, because opal gems contain some water, opal jewelries should be worn often as possible because opals, being porous, will absorb the needed humidity from the air and from the skin of its wearer. 

However, remove any opal jewelries, especially rings, when exercising, playing sports, and gardening as to avoid scraping and damaging the opal. Do not wash dishes and shower with opals as well because the sudden temperature change can cause the opal to craze.

To further help keep moisture and prolong the dazzling beauty of the gem, soaking the opal in water for several hours from time to time will protect the opal from crazing. Do not use oil, soaking or wiping, on the opal as oil can potentially damage the opal by causing the opal to lose its prized fire over time.

Cleaning: Opal gemstones can be simply cleaned with plain warm water or soapy water with a facial tissue or piece of silk. Be mindful that dust, which may contain quartz with hardness of 7, can slowly reduce the polish by simply wiping off the dust. Clean doublets and triplets the same way but do not soak them. Do not use ultrasonic and steam cleaning methods, as those methods may be too harsh for opals.

Doublet & Triplet: Doublet and triplet opals should not be exposed to extended periods of bathing or swimming because it is difficult to predict how the glue will react under such conditions. This includes washing dishes as the detergent can weaken the glue.

For more information and how to obtain excellent opals from a great selection, feel free to visit: Opal Gem Auction

Where to buy the gell for the ultrasonic facial machine?

Be more specific, what type of Gel and what brand is the machine? Usually that's something you would be able to order from the company that manufactures the machine. We have a micro-currant machine and we have to buy our products from the manufacturer. I would Google the name of the machine and try to find there website. You can also try searching through an esthetic supply catalog like Universal.