What is Jasper?


Jasper is an opaque variety of chalcedony, and it comes in a multitude of colors including red, yellow, and brown. It’s primarily found in India, Russia, and the U.S. Jasper is known for its unique patterns and is often used as a gemstone.

Jasper is a colorful gemstone that comes in various patterns and hues. Its unique appearance makes it a popular choice for jewelry and decorative items, especially beads, pendants, and cabochons.

Gemstone Properties

Chemical ClassificationInorganic - Silicate (Chalcedony)
ColorMany colors including red, yellow, brown, green, and occasionally blue, often mottled or striped.
LusterDull to vitreous when polished.
OccurrenceWorldwide, including significant sources in India, Russia, and the USA.
FormationUsually forms from volcanic ash or fine silicate mud, solidifying over time under heavy pressure.
Mohs Hardness6.5 to 7
Specific GravityApproximately 2.5 to 2.9.
Diagnostic PropertiesOpaque, often red or banded.
Chemical CompositionSiO2
PleochroismDoes not display pleochroism.
Crystal SystemHexagonal (variety of Quartz)
Optical PropertiesUniaxial (+)
Refractive Index1.530 - 1.539
2V angleMeasured: 78° to 82°