Opal Jewelry: Meaning, Benefits, Origins, Colors, Pairing & Caring
A mixture of water-rich silica makes up the opal. The degree of hardness is approximately 5-6 degrees. Therefore, it is difficult to scratch or dry in storage or use. Opal was formed between 2000 and 300 million years ago. It is necessary to heat up to 260 degrees Celsius to destroy an opal. The value … Read more