Evaluation of Opal
Opal is a complex stone to evaluate and this task falls mainly in the hands of experts with years of experience. There are eleven more … Read more
Classification of Opal
‘Play of Colour’ is a unique visual phenomenon which sets precious Opal apart from all other gemstones. Also known as ‘Fire’; An Opal may display … Read more
Opal Identification
GEMMOLOGICAL LABORATORY FACT SHEET Chemical composition of Opal: Si0 2nH 20 – Hydrated Silica. • Water content in Precious Opal 3-10%. • Water content … Read more