Genuine Diamond Emerald Cut

How much are precious stones worth?
Does anybody have a source explaining the value of gemstones?
I understand that Diamonds are of course top of the list but what about things like Emeralds, Rubies and Amethysts?
Sometimes you will see a piece of jewellery with a stone in and it's quite pricey - but hard to tell if it's the value of the stone you are mainly paying for or just the the precious metal it's set in...
I recently bought a sterling silver charm with a genuine amethyst in and though i'm chuffed that I got it so cheap (£5) i'm now wondering how 'precious' these stones really are...
(The Amethyst is 'oval cut, 0.75 carat and measures 7x5mm)
It is 100% genuine for sure.
http://www.gemstone.org/gem-by-gem/english/emerald.html
Just click next at the bottom to get the next gemstone.
http://www.gemval.com/
http://www.google.co.uk/search?hl=en&q=how+to+value+gemstones&meta=
http://www.jewelrymall.com/stones/
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10.02 ct Emerald Cut G Color VVS2 Clarity GIA Certified Genuine Loose Diamond $832,477.00 |
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12.85 ct Emerald Cut H Color VVS2 Clarity GIA Certified Genuine Loose Diamond $797,546.00 |
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11.13 ct Emerald Cut H Color VS1 Clarity GIA Certified Genuine Loose Diamond $600,417.00 |
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7.78 ct Emerald Cut D Color VVS2 Clarity GIA Certified Genuine Loose Diamond $595,637.00 |
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5.14 ct carat Emerald Cut D Color IF Clarity GIA Certified Genuine Loose Diamond $548,541.00 |
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5.18 ct carat Emerald Cut D Color IF Clarity GIA Certified Genuine Loose Diamond $504,739.00 |
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15.02 ct Emerald Cut J Color VS2 Clarity GIA Certified Genuine Loose Diamond $461,802.00 |
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10.43 ct Emerald Cut I Color IF Clarity GIA Certified Genuine Loose Diamond $460,517.00 |
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10.43 ct Emerald Cut I Color VVS1 Clarity GIA Certified Genuine Loose Diamond $460,517.00 |
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15.09 ct Emerald Cut J Color VVS2 Clarity HRD Certified Genuine Loose Diamond $428,508.00 |
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6.54 ct Emerald Cut F Color VVS2 Clarity GIA Certified Genuine Loose Diamond $368,699.00 |
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6.28 ct Emerald Cut D Color VVS2 Clarity GIA Certified Genuine Loose Diamond $360,598.00 |
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11.47 ct Emerald Cut J Color VVS2 Clarity HRD Certified Genuine Loose Diamond $348,330.00 |
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5.59 ct Emerald Cut E Color VVS2 Clarity GIA Certified Genuine Loose Diamond $341,728.00 |
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Beautiful SOLID 10k Gold Genuine Yellow Citrine Emerald Cut Fashion Ring - Comes Gift Boxed! $229.99 Absolutely Beautiful Solid 10k Gold Ring (NOT PLATED). Wonderful Gift Idea for your Loved One!... |