\t http://facetroughgemstones.com/myblog/index.php Copyright 2010, FacetRoughGemstones (FacetRoughGemstones) en-US SPHPBLOG 0.4.0 http://facetroughgemstones.com/myblog/index.php?entry=entry050320-041157 ~ What to look for when buying gem stones : 4cs ( Color Clarity Carat Cut )
The colour is one of the most important attributes to look for when purchasing a stone ~ Top color in stones adds to their value

The clarity is an attribute of a gemstone that refers to how clear a stone is ~ Some gemstones are known to have excellent clarity and only under high magnification will any inclusions be found ~ Others are known for some inclusions and if not excessive will still cut a very nice stone and do not affect their desirability ~ GIA grading standards break these types of stones into stone Types

Price and the hardness of the stone are two other considerations

{ Moh's Hardness Scale } ~~~ { Mineral List }


Type I: Usually clean ( aquamarine citrine tanzanite ... )
Type II: Inclusions common ( peridot sapphire tourmaline garnet [all] spinel [all] ... )
Type III: Normally have inclusions ( emerald rubellite red beryl ... )

With Type II some inclusions are expected and do not affect them being desirable ; as with Type III , unless they have many inclusions they are still cut into very nice stones

The carat weight of the stone is important due to the value of the stone ~ Gems are typically sold based on the number of carats

The cut or shape of the stone ~ The dimensions of a stone helps cutters determine how a stone will be cut (e.g. oval round marquise pear princess trillian square emerald heart etc.)


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Some of the stones we offer :
Tanzanite ~ Demantoid ~ Tsavorite ~ Tourmaline ~ Indicolite ~ Opal ~ Chalcedony ~ Spessartine ~ Russian Chrome Diopside ~ Peridot ~ Apatite ~ Amethyst ~ Ruby ~ Red Beryl ~ Kyanite ~ Sapphire ~ Emerald ~ Citrine ~ Mandarin Spessartite & Malaya Garnet ~ Amethyst ~ Mystic & Paraiba Topaz ~ Aquamarine ~ Rhodocrosite ~ Chrysophase ~ Agate ~ Sunstone ~ Turquoise ~ Drusy Druzy


Gemstone varieties & interesting facts
GARNETS
Almandine , Andradite , Grossular , Pyrope , Spessartine & Uvarovite
Found in the United States, Russia , Africa , South America , etc.
In every fancy bright & beautiful color shade & hue except for blue and can have a rarity color change or be colorless
A durable stone with Mohs hardness scale of 7-7.5
Usually brilliant because of high light refraction
The more expensive varieties are Tsavorite and Demantoid and rough garnets can come in crystal shapes and sides
January birthstone , Zodiac sign Aquarius , 2nd & 6th wedding anniversary gift Associated with healing & protection
An ancient gem found in handmade antique vintage fashion jewelry used by artisians way back to the Egyptians and Tzars and known in Greek and Roman times
A cherished , valued , prized & popular gemstone

CORUNDUMS ( Ruby & Sapphire )
RUBY
Mohs hardness scale of 9 & closest to the diamond for hardness
Only the red Corundum is referred to as Ruby and all other colors in this gemstone group are referred to as Sapphires
Rubies are rarer than the Sapphire and typically more expensive
Common localities are Burma , Africa & Thailand and many found in crytal shapes
July birthstone , 15th & 40th anniversary and Zodiac sign of Capricorn
Typically heat treated when the rough is lighter to produce strong colours in the finished gem
SAPPHIRE
Mohs hardness scale of 9
September birthstone & 5th, 23rd and 45th wedding anniversary stone and Zodiac signs of Pisces , Taurus , Virgo and Sagittarius
Found in Burma , Africa , South America etc. and can have common crystal shapes
A favorite gemstone by consumers with the most expensive being
The natural orange pink Padparascha often referred to as a Pad Sapphire
The Star , Cat's Eye & color change sapphires are other types
Typically heat treated when the rough is lighter to produce strong colours in the finished gem


TOURMALINE
Bright rainbow colors including bi-colored and watermelon and occurs in more colors than any other gem stone variety
Found in Africa , Brazil , South America , Pakistan and Afghanistan , USA etc.
7.0 - 7.5 on the Mohs hardness scale
October birthstone & 8th year anniversary stone and Libra Zodiac sign
Found in Crystals and other shapes
Top Paraiba and Pink Tourmaline are some of the more expensive and sought after
The deep red colour of Tourmaline is referred to as Rubellite
Blue Tourmaline is typically referred to as Indicolite
There is also a Chrome Tourmaline which is an emerald green

BERYL
Comes in a number of different colors
Mohs scale hardness 7.5-8
Found in Africa , South America , USA etc.
Aquamarine is a light blue to blue green to santa maria / marie color ~ 19th anniversary
Emerald is green and one of the most popular and valuable of gems ~ May birthstone & 20th & 35th anniversary
The pink variety is known as Morganite often called Pink Beryl
Peach Beryl has an orange pink color
Helidor is yellow , yellow green orange and brownish
Golden Beryl is a Helidor but has a yellow golden colour
Goshenite is colorless
Green Beryl is not the same as an Emerald and is lighter
Red Beryl Bixbite is one of the rarest of all gems

OPAL ( common and precious )
A treasured stone throughout history
14th anniversary & October birthstone
Found in Australia , South America ( Mexico & Brazil ) , USA etc.
Mohs hardness scale of 5.5-6.5
Can be translucent or opaque and can have fire plays of color or be potch ( without color play )
Common types are Mexican fire ( also referred to as cherry or mandarin opal ) , black ( Lightning Ridge & Mintabie ) , boulder ( Western Queensland ) , milky white ( Coober Pedy )
Other special opals without color play are the Peruvian Blue / Blue-Green and Pink , the green Opal near Macedonia and the yellow opal in Africa


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Quartz
Mohs hardness factor 7
Found worldwide in many colors
Chalcedony (agate chrysoprase jasper carnelian onyx etc)
Other common types
Amethyst
Citrine
Rose Quartz
Smoky Quartz
Green Quartz
Colorless
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