An alloy is a mixture or solid solution composed of a metal and another element. In practice, alloys are used so predominantly in the costume jewelry industry. Generally speaking, the hardness of the alloy jewelry is greater than any other metals in the component and some are even good in corrosion resistance.
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Opal is a hydrated amorphous form of silica, its internal structure makes it diffract light. Depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black, which has the sheen of the glass and waxy luster generally. With its perfect cutting and unique color, it is used widely in the jewelry industry.
You can find them clear and unique in patterns as well as good quality from Viennois-online, a jewelry company with over 20 years experience in fashion jewelry industry, and now it has become a leading company in jewelry industry and the NO.1 jewelry exporter in China. It will be your first choice to wholesale opal earrings to improve your business ROI.

Protection of gemstones
When you keep your colored gemstone, you just need to remember that all things you use on jewelry should be soft and dry to avoid hurting jewelry's appearance. In a word, you should protect your jewelry like a baby.
Daily cleaning and keeping
When you clean earrings, you need to prepare something simple and common such as opera, warm water as well as towel. After your cleaning, you should put your earrings at a clean places with enough air.