Opal, inorganic substance from the silica group. It covers all varieties of silis with hydrate and gelatin. Opal is a colloite; The composition contains 3 %to 13 %water; Its appearance is fat or glassy, the broken surfaces are similar to the curved. There are many varieties, among them the most well-known noble opal. = "font-you: 14px;"> The gift package is available. (Product price is not included in the gift packages.) contact should be avoided. Silver jewelry should be stored in a transparent locked bag in a way that will not take air and not contact with other jewelry.