QUARTZ WITH RUTILE INCLUSIONS

Rutile is a titanium oxide mineral with a very high refractive index, found as an inclusion in quartz, as well as many other gems.
It appears as needle or rod--like crystals which can be randomly scattered through a gem or as a denser mass of intertwined needles forming complex patterns.
Rutile occurs in a range of colours, from black to reddish-brown to gold, with its metallic lustre making it a popular and striking feature.