The opals that are used in opal jewelry come in an assortment of colors. There are rich blues, greens, reds and even gold. This combination of colors brings to mind a vision of the gems being alive with the color. The opal is a very brittle stone that needs moisture to maintain its structure. It is said that opals love to be worn, quite possibly because by being on the skin it can absorb the moisture around it and keep its beauty. Black opal jewelry is very sought after.