Which Opal Stone Is Best?

Black opal is the most prized opal and may realise prices over AUD $15,000 a carat. Boulder opals also have a dark body tone. White opals have a light body tone and are generally the least valuable form of opal.

Which colour opal is best?

The body colour of an opal is very important to its value. Opals with black body colour are more valuable than any other hue, for example blue, white, orange or colourless. A factor to consider within the main body colour is the tone.

What is a good quality opal?

Black opals are generally considered to be the best in the world due to their dark body tone. ... White opals have a 'milky' white body tone, and are much more common. The white body tone often causes the colour to be less bright, however by the same token, high quality white opals can be captivating.