This drilled Australian boulder opal is approx. 4cm in size and weighs 30g; drill hole diameter approx. 2.6mm.
The brown matrix with thin, colored (mostly blue) opal veins is characteristic of Australian boulder opals.
In gemstone healing, boulder opals are used when humor and joie de vivre need to be strengthened. The colorful opal helps people to infect others with their own (life) joy and not to lose courage and confidence despite sometimes difficult circumstances.