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Variety of Gemstones And Gems

Updated on September 4, 2011

Gemstones, also called as precious stones, are naturally available rare stones of earth. They get different names according to the chemicals present in them. Some important varieties of gemstones are diamond, corundum, beryl, coral and pearl.



Diamond is a precious stone made of pure carbon. It is allotrope form of carbon and noted for its hardness. The diamonds are white or pale yellow in colour. Less often they are also available in blue, green, yellow and black. Under the deep part of our earth, extreme pressure and temperature change carbon to glittering diamonds. Diamond's crystal system is cubic, hardness in Mohs scale is 10, refractive index is 2.4175, density is 3.5 gm/cc and melting point is 3,547 degree centigrade. About 26 tonnes of natural diamond is mined per year from all over the world. It is widely used in jewelry and optical industries.


These are naturally found stones made of Aluminium trioxide. Ruby and Sapphire are two important varieties of corundum.



It is dark pink or red in colour, sometimes available in brownish or purplish. It is a Cr containing Aluminium trioxide. Its crystal system is trigonal. Its hardness is, next to diamond, 9 in Mohs scale. The refractive index is 1.762 and its melting point is 2050 degree centigrade. It can not be considered as a precious stone alike diamond.

Blue Sapphire


It is also a semi precious stone made of Aluminium trioxide and available in many colours except red. Its crystal system is trigonal and hardness in Moh scale is 9 and refractive index is 1.762. Its melting point is around 2,000 degree centigrade.


These are beryllium containing Aluminium silicate compounds. These are classified to semi precious stones. Available in green, red, yellow and pink. Emerald, Aquamarine, Bixbite and Morganite are some of Beryl stones.


This is a variety of mineral beryl. This is green in colour and have hardness of 7.5 - 8. There are some traces of chromium in this compund. Its crystal system is hexagonal and refractive index is 1.576 - 1.582




This is also one of the Beryllium containing Aluminium silicates and having delicate blue color. Its crystal system is hexagonal and has hardness of 7.5 - 8. Its refractive index ranges from 1.57 - 1.58. It has wide range uses in jewelry industries.




This is a red variety of Beryl. Available in orange red to purple red. Crystal system is hexagonal and hardness in Mohs scale is 7.5 - 8. Its refractive index is1.567 - 1.580 and has melting point around 2000 degree centigrade. Manganese presents in it gives red color to it.



This is a light pink colored Beryllium containing Aluminium silicate compound. Its crystal system is hexagonal and hardness varies as 7.5 - 8. Its refractive index is 1.57 - 1.58. Right side shown is one of the larger morganite retrieved from Elizabeth mine in Pala, California in the year 2005




These are skeletal remains of marine organisms(Anthozoa) and have blood like red color. Main chemical content is CaCo3 and it is considered as a semi precious gem. These are widely used in jewelry. Largely found in Great Barrier Reef off coast of Queen island and Australia.



It is a pale white colored hard object produced with in soft tissues of a living shell mollusk. CaCo3 is the main chemical content. The good quality of pearl is valued as gem stone. It is naturally available in the seas. However cultured pearls are more valuable than natural ones. pearls are widely used in jewelry and medicines.


Submit a Comment

  • profile image


    8 years ago

    realllllllllllllllllllllly great.....................wants more information

  • ratnaveera profile imageAUTHOR


    9 years ago from Cumbum

    Dear JYOTHI KOTHARI, Thank you very much for visiting this Hub and your nice comments. I got all these photos from internet. I am very happy to see your interest on Gems. I will visit all of your hubs and put my comments! Once again thanks for your writings on Gems.

  • JYOTI KOTHARI profile image

    Jyoti Kothari 

    9 years ago from Jaipur


    Where did you find all these awesome photographs? details are really informative. You have described some lesser known stones too.

    We have posted some videos in you tube Gems and Jewelry and posted some of them in my Jewelery hubs. You can feel free to use those in your hubs.

    I have also written some hubs about Gems and Jewelry, ruby, sapphires, diamonds, kundan meena jadau jewelry etc.

    I will like to see there and appreciate your comments.

    Jyoti Kothari,

  • ratnaveera profile imageAUTHOR


    10 years ago from Cumbum

    Dear Mallu and Siddhinfo thank you both for your comments.

  • siddhinfo profile image

    Shrihari Sawant 

    10 years ago from Goa (India)

    Really fantastic blog. Good to read and see

  • mallu profile image


    10 years ago



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