Stone #2 is the $1000
Stone #3 is the $800
Stone #4 is the $600
Stone #1 is the $400
Understanding how solid opals are valued. There are 8 things that determine value... type, brilliance (brightness), colour (colours/colour combination), pattern, shape, tone, transparency & thickness.
Brilliance (brightness) is the most important value determining feature. It is the most attractive quality and the rare quality.