Blog on gemmology
http://studiopjj.blogspot.com/2007/07/gemmology-on-shoestring_07.html
Look through their articles, a great archive of articles
http://tinyurl.com/y9sd8fw
http://www.jewelinfo4u.com/Gemologists.aspx
A great gemmology bibliography
http://www.nordskip.com/resources.html
http://www.agta.org/gemstones/agta-gim/index.html
http://www.rockhounds.com/rockshop/table.shtml
http://www.feeg.net/
http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/index-back-issues-1934-80.html
http://www.gia.edu/research-resources/gems-gemology/gemsgemologycurrentissue.html
http://www.gaaj-zenhokyo.co.jp/index-e.html
http://blog.nwgem.com/2008/10/gemstone-identification.html
http://www.galleries.com/minerals/physical.htm
http://www.preciousgemstones.com/Forecasters.html

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Charts and Tables
http://nature.berkeley.edu/classes/eps2//wisc/tables.html
http://www.gemsociety.org/info/info.htm#ref
http://www.gemlabtools.com/ri-alphabetical.html
http://www.gemlabtools.com/ri-numerical.html
http://www.aigsthailand.com/AIGSPage.aspx?mID=3&sID=66&type=NewDisclosureCommentsforHeatProcess
http://gemologyonline.com/gemstone.html
http://www.gemselect.com/gem-info/refractive-index.php
http://www.gemselect.com/gem-info/dispersion-chart.php
http://ayurvedicjewelry.com/planetary_gems.html
http://www.gemselect.com/gem-info/specific-gravity.html
http://www.prettyrock.com/php/mineral-properties.php?single_property=specific_gravity
http://www.ruby-sapphire-tourmaline.com/DiamondWeightChart.php
http://www.ruby-sapphire-tourmaline.com/GemsWeightChart.php
http://www.gemselect.com/gem-info/cleavage-chart.php
http://www.csgnetwork.com/gemchar.html
http://gemologyonline.com/csi.html

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Gem Descriptions
http://www.yourgemologist.com/thegemstones.html
http://nature.berkeley.edu/classes/eps2//wisc/image.html
http://nature.berkeley.edu/classes/eps2//wisc/glossary2.html
http://gemologyproject.com/wiki/index.php?title=Alphabetic_list_by_gemstone_name0--"
http://gemologyonline.com/gemstone.html
http://www.cigem.ca/510.html
http://www.agta.org/gemstones/index.html
http://www.geminfo.com/a-zgeminfo.html
http://www.gemsociety.org/info/info.htm#gem
http://www.gemlabtools.com/gem-photo-library.html
http://www.gia.edu/research-resources/gia-gem-database/data-acquisition.html
http://www.gehnabazaar.com/gemstones/34/coral.html (Look at the gem listings on the right of this page)
http://www.dulyon.com/gemstone_library/
http://www.gemhut.com/info.htm
http://www.edelsteine.at/gemstone-glossary/a/
http://www.palmbeachgems.com/gemstone_articles.htm
http://www.galleries.com/minerals/physical.htm
http://www.galleries.com/minerals/byname.htm
http://www.adrian-smith.co.uk/interest-item.html
http://www.yourgemologist.com/zandrite.html
http://www.handmadebeadedjewelry.org/blog/gemstone-list-info/#ac
http://www.awesomegems.com/gemfacts.html
http://www.alexandrite.net/chapters/
http://www.bwsmigel.info/A-Z.ppt.pdf
http://www.gemtec.com/
http://www.jewelinfo4u.com/GemStones.aspx
Exerpts from Richard Hughes great book on rubies and saphires
http://www.ruby-sapphire.com/r-s-bk-quality3.htm
http://www.ruby-sapphire.com/r-s-bk-quality4.htm

Minerals
Wurzburg Museum mineral specimens
http://www.equisetites.de/gallery/index.htm
http://www.gimizu.de/sgmcol/
http://homepages.udayton.edu/~koziolam/resminpet.html
http://webmineral.com/help/Forms.shtml (paper models of crystals)
http://webmineral.com/
http://www.mindat.org/index.php
http://www.gly.bris.ac.uk/www/teach/opmin/mins.html
http://earthsci.org (Earth Science Australia told us of a number of these mineral sites)

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Gemstone Inclusions
http://www.cigem.ca/inclusion/inclusions.html
http://www.ruby-sapphire.com/r-s-bk-ch5.htm
http://www.apsara.co.uk/content/view/12/27/
http://www.gemyes.com/gemology.html
http://www.aigsthailand.com/Inclusion_Pictures.aspx
http://www.gaaj-zenhokyo.co.jp/inclusion_gallery/inclusion_gallery.html
http://www.gubelinlab.com/
http://www.aglgemlab.com/News/composite%20ruby.pdf
http://giclee-prints.microworldofgems.com/
http://www.palagems.com/inclusions.htm
http://photomicrography.microworldofgems.com/ (download article at bottom of this page)
http://www.flickr.com/groups/1158167@N23/
http://www.imagesontheweb.net/galleria/thumbnails.php?album=11
http://www.hkdlab.ca/gemstoneinclusion.htm
http://jewelrygallery.imagesjewelers.com/thumbnails.php?album=1
http://www.edelsteine.at/gemstone-treatments/
http://www.galleries.com/minerals/by-name.htm
http://www.bwsmigel.info/Lesson5/DE.Magnification.html
http://www.degoutiere.com/inclusions-gallery/public_html/newinclusions.html
http://www.flickr.com/search/?q=%22gemstone+inclusions%22&w=all&s=int&referer_searched=1
http://www.gemtec.com/inclusions.html

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Visual Optics (Hanneman-Hodgkinson Slit Technique)
http://www.cigem.ca/411.html
http://www.cigem.ca/421.html
http://www.scotgem.co.uk/moissonite.htm
http://www.gemstoneartist.com/GemID.asp
http://www.nordskip.com/hh.html
http://www.pricescope.com/idealbb/view.asp?topicID=10635

Equipment  and gemmology articles
http://tinyurl.com/yc2aon2
http://www.jewelinfo4u.com/Gemstone_Testing_tools.aspx
http://www.nordskip.com/tools.html
http://www.gemsociety.org/info/agem5.htm
http://www.gaaj-zenhokyo.co.jp/researchroom/kiki_01-en.html
http://nature.berkeley.edu/classes/eps2//wisc/Lect5.html
http://www.emporia.edu/earthsci/amber/go340/gemtest.htm
Polariscopes
http://www.yourgemologist.com/Polariscope/polariscope.html (check out the rest of the articles here)
http://www.yourgemologist.com/Sunglass%20Polariscope/sunpolariscope.html
http://www.ganoksin.com/borisat/nenam/polaris.htm
http://gemologyproject.com/wiki/index.php?title=Polariscope
http://www.free-form.ch/storys.html (check out the rest of this site)
http://www.yourgemologist.com/studyofgemology.html
http://gemologyproject.com/wiki/index.php?title=Equipment_used_to_identify_gemstones
http://homepage.rub.de/olaf.medenbach/eng.html (amazing images of interference figures-advanced stuff)
Fantastic spectra database
http://www.jewelinfo4u.com/Spectroscope.aspx
http://www.gemlab.co.uk/SpectraDatabase.html
http://www.prettyrock.com/spectroscope-instructions.htm
Chelsea filter reactions
http://gemologyonline.com/chelsea_filter.html
http://www.free-form.ch/tools/chelsea.html

Optic sign on the refractometer and Polarizing filter on the regractometer
http://www.nordskip.com/notes.html
Immersion facet contrast used with new sapphires
http://www.ruby-sapphire.com/treated_orange_sapphire.htm
http://www.esslinger.com/howtoidentifygemstones.aspx

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Diamonds, simulants and synthetic diamonds
http://www.gemsociety.org/info/chsize.htm
http://nature.berkeley.edu/classes/eps2//wisc/Lect6.html
http://www.attawaygems.com/NMFG/update_on_synthetic_diamonds.html
http://www.hwgem.com/hwl_old_news.htm
http://dendritics.com/scales/synthetic-diamonds-final-report.asp
http://ist-socrates.berkeley.edu/~eps2/wisc/Lect6.html
http://www.professiona ljeweler.com/archives/articles/2000/sep00/0900dg1.html
http://www.jewelryexpert.com/articles/articles.htm
Great article on diamond simulant detection by Hodgkinson
http://www.scotgem.co.uk/moissonite.htm
Separating Diamond simulants
http://www.nordskip.com/notes
Moissonite notes
http://www.lacywest.com/t_mtest.htm#howtotest
http://www.gemguide.com/news/archives4.htm
http://diamondidentity.com/differentiating-cubic-zircona-from-diamond.php
Cubic zirconia id
http://www.allaboutgemstones.com/diamond_simulants_cubic_zirconia.html
http://www.yourgemologist.com/CubicZirconia/cubiczirconia.html
http://www.wikihow.com/Tell-if-a-Diamond-is-Real
http://www.ehow.com/how_4443185_identify-cubic-zirconia.html

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Gem enhancements and Treatments
http://www.agta.org/gemstones/index.html
Gem enhancement manual http://www.cigem.ca/368.html
http://jewelry.about.com/od/gemstonetreatments/
http://nature.berkeley.edu/classes/eps2//wisc/Lect10.html
http://www.multicolour.com/catalogue/columns/column122000.html
http://www.palagems.com/enhancements.htm
http://www.emporia.edu/earthsci/amber/go340/create.htm
http://gemologyonline.com/treatment.html
http://www.gemmology.lk/more.php?id=4
http://www.gemmology.lk/more.php?id=35
http://www.gaaj-zenhokyo.co.jp/researchroom/corundum/heat-treatment_01en.html
http://www.agta.org/education/index.html
http://www.professionaljeweler.com/archives/articles/2002/oct02/1002dg2.html
http://www.minedirect.com/GemstoneEnhancement.html
http://www.gemhut.com/enhance.htm
http://www.bwsmigel.info/Lesson8/DE.Gem.Enhancement.html
http://www.gemselect.com/gem-info/fracture-filled.php
http://www.gemselect.com/gem-info/heat-treatment.php
http://www.gemselect.com/gem-info/irradiation.php

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Synthetics
http://www.bellaonline.com/articles/art44877.asp
http://www.yourgemologist.com/synthetics.html
http://www.yourgemologist.com/synthetics.html
http://www.bwsmigel.info/Lesson9/DE.Synthetics.Simulants.html
http://gemologyonline.com/synthetics.html
http://www.bwsmigel.info/GEOL.115.ESSAYS/Synthetics.Simulants.Fakes.html
http://www.bwsmigel.info/GEOL.115.ESSAYS/Synthetics.Simulants.Fakes.html
http://www.ramaura.com/
http://www.ramaura.com/article.htm
http://www.jewelinfo4u.com/How_to_differentiate_synthetic_and_natural_emerald.aspx