You can find all kinds of little Gems of gemstone and jewelry knowledge over at Gabriel & Co. Though I did find the music a little irritating after awhile, I simply turned down my speakers so I could read through their information on jewelry care and education, which covers all kinds of factoids about semi-precious and precious gemstones.

Once you are on the site, select the "Consumers" link, and you'll see a drop down menu for care and maintenance, education (that's where they have the gemstone information), and store locator.

I was particularly impressed with the gemstone information. As you select a gemstone on the left hand side, for example peridot, a picture of the stone shows up and on the right hand side a list of details such as stone hardness, color, and so on. Scroll even further down and on the left you'll see a button for the web site's diamond guide. This brings you to yet another page that covers the 4 Cs of diamonds.