Video answer: How to value opal and why it is difficult blackopaldirect.com
Top best answers to the question «What makes a good quality opal»
There are three main aspects of an opal's quality: Color—Background color and play-of-color. Pattern—Arrangement of play-of-color. Clarity—Transparency and quantity of inclusions.
What makes a good opal? ... The type of opal, body tone, brilliance, pattern, colour bar thickness, the play of colour, and faults all play important roles in determining the value. Other important factors include the quality of the cut & polish, and the size of the stone.
Video answer: What is ethiopian opal - value & meaning