The Gemstone Dumortierite
Dumortierite is a minor blue gemstone that usually forms as inclusion
s in Quartz
. Its most common color is blue or grayish-blue, though pink and purple colors are also known. Dumortierite's durability, combined with a high hardness, would make this an ideal gemstone, but the lack of transparency and often dull luster
limit its use.
Blue, Pink, Purple
1.67 - 1.72
0.01 - 0.04
Translucent to opaque
3.3 - 3.4
Pure Dumortierite gemstones are rarely encountered. Most lapidary
-grade Dumortierite is dense blue inclusion
s of Dumortierite within Quartz
. These gemstones are often called by the confusing term "Dumortierite Quartz", or may even be called "Blue Quartz". The inclusions can be present throughout the Quartz, or in splotches or zones, resulting in light and dark blue color zones.
The properties listed above are inherent to pure Dumortierite. However, since most Dumortierite gemstones are actually Quartz
with Dumortierite inclusions, the properties listed under Quartz are the more accurate gemstone reference.
Dumortierite is a minor gemstone used mostly in cabochon
s and lapidary
Treatments & Enhancements
Dumortierite gemstones are natural and not treated or enhanced.
Dumortierite sources include Brazil, Peru, Madagascar, Namibia, Austria, and the U.S. (California).
Dumortierite has a greater hardness
than Lapis Lazuli
, and usually lacks the white veins often present in these two gemstones.
Dumortierite in the Rough Photos