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MOS Scale
Where in the World
Did you Know
Enhancements and Care
Color me pretty
100
This cryptocrystalline varity of quartz has a hardness rating of 6.5 to 7.
What is Bue Chalcedony?
100
The largest of this gemstone, 168 carats, is located at the U.S. Smithsonian National Collection in Washington D.C.
What is Emerald?
100
This gemstone is considered the king of gemstones.
What is Ruby?
100
This gemstone is often heat treated to enhance it's pink color.
What is Morganite?
100
This soft-lustered gemstone forms into a variety of warm colored hues. The most prized is a golden to reddish color.
What is Amber?
200
This "gemstone of the sun" has a hardness rating of 7.5 to 8.
What is Yellow Beryl?
200
Translated from Latin, this gem means "sea water."
What is Aquamarine?
200
Tiffany & Co.'s chief gemologist, George F. Kunz, named this gemstone after New York banker J.P. Morgan.
What is Morganite?
200
Avoid sudden temperature changes with this "clean" gemstone, which exhibits few inclusions.
What is Green Beryl?
200
When cut, gentle layers of soft shades of blue to lavender create an exquisite linear pattern of color.
What is Blue lace agate?
300
This gemstone in the Beryl species has a hardness of 7.5 to 8.
What is Aquamarine?
300
Ancient Egyptian tombs have often been found with this gemstone, because of their belief that it was helpful with guiding the soul into the afterlife.
What is Carnelian?
300
Aquamarine, Emerald and Morganite are all members of this gemstone species.
What is Beryl?
300
This gemstone, carved by the Ancient Romans for Cameos, is routinely dyed to even out color.
What is Onyx?
300
One spectacular feature of this gemstone is that no two pieces look alike. Translucency, colors and patterns will vary from stone to stone.
What is Brown Banded Agate?
400
This gemstone's hardness rating of 9 makes it durable for everyday wear.
What is Sapphire?
400
Emeralds sold by Tiffany and Company are only sourced from this esteemed location.
What is Columbia?
400
Tiffany & Co. actively supports the Too Precious to Wear Campaign, protecting this species.
What is Coral?
400
This is not a tough gemstone. Customers should be informed that this form of Beryl may chip if handled improperly.
What is Emerald?
400
The color in both pink sapphires and rubies are caused by this trace element in the gemstones composition.
What is Chromium?
500
This brick red gemstone, member of the Chalcedony species has a hardness of 6.5 to 7.
What is Jasper?
500
This gem was first discovered in 1830, in Russia. It was named after Czar Alexander II.
What is Alexandrite?
500
Congress enacted this bill banning importation of all products from Burma because of the ruling military regime.
What is the Burmese Freedom and Democracy Act of 2003.
500
We do not accept dyeing for this gemstone, with it's extraordinary green color being all natural.
What is Chrysoprase?
500
This gems green to blue color is derived from the copper mineral chrysocolla.
What is Chrysocolla Chalcedony?