Peridot rock

By Yves Lemay Jul 03, 20

Peridot rock

Chemistry: Mg2SiO4-Fe2SiO4


Crystallography: Orthorhombic


Refractive index: 1.635 - 1.673


Hardness: 7


Specific gravity: 3.3 - 3.4


Cleavage: Imperfect


Heat sensitive: No


Wearability: Very Good


Special care instructions: None


Enhancements: None


peridot rock yves lemay jewelry

Peridot belongs to the forsterite-fayalite mineral series, which is part of the olivine group. 


It is one of the few "idiochromatic" gems, meaning its color comes from the basic chemical composition of the mineral itself, not from minor impurities, and therefore will only be found in shades of green. 


Historically important sources in Egypt have been superseded by today's primary sources in Arizona and Pakistan. 


This gemstone's high birefringence necessitates careful orientation in cutting to prevent "fuzziness" of reflections through the table. 


A distinctive, disk-like liquid and gas "lily pad" inclusion can often be seen under magnification.


peridot rock yves lemay jewelry

An interesting fact here: it can sometimes be found... in meteorites!!!


Ancient Egyptians believed that peridot was sent to Earth by the explosion of a star and carried its healing powers. 


A lesser-known fact: in 2005, some peridot was found in comet dust brought back from the Stardust robotic space probe.


Peridot is, actually, the national gem of Egypt and is known to locals as the Gem of the Sun.


Being green, could have peridots sometimes been mistaken for emeralds and other green gems? 


Yes indeed! 


The famous gemologist George Frederick Kunz (who named the gem Morganite in honor of financier J.P. Margan, and that even has a gem named after him, the Kunzite) discussed the confusion between emeralds and peridot in many church treasures, notably the "Three Magi" treasure in the Dom of Cologne, Germany.


So, peridots are, alongside with spinels, one of the historical imposters of the gemological world.


This is understandable though, as people back there in time did not have proper general gemological knowledge, so, well, a green stone was just... a green stone. 


When knowing that the early Egyptians also had emeralds, the conflation of the 2 gems as being of the same nature makes sense.


peridot rock yves lemay jewelry

Value

The vast majority of peridot rough produces sub-carat sized stones, which in commercial quality are quite inexpensive.


peridot rock yves lemay jewelry

Thanks for reading, and please feel free to share this article with your contacts!

What diamond color is best
Most people describe diamonds as *white*, standard typical diamonds that we see in our daily lives. But this is wrong...
Why is 0.95ct better than 1ct diamond? - Diamond shapes and carat weight: pay less, get more!
Why is 0.95ct better than 1ct diamond? Diamond shapes and carat weight: pay less, get more!
The GIA colored stone grading system
The beautiful color of a gemstone is its most defining characteristic, and many jewelers consider it to be the most...
How to appreciate the quality of jewelry (before you buy)
When it comes to appreciating the quality of a piece of jewelry, there are three major things you must look for: -Base...
Everything that you need to know about jewelry metals
If I say the word "ring," the first image that will come to mind for most people will be yellow-colored....
The 4 types of pearls that you need to know before purchase
There are two major types of cultured pearls; freshwater and saltwater pearls. Freshwater pearls primarily come from China.Saltwater pearls, which include...

Leave a Comment