When your items say they are made out of genuine leather, top-grain leather, or full-grain leather , you should know what that means. salsaboy / Flickr Usually found on the underside of a belt or inside a leather good, a product's leather quality will be stamped one of three things: genuine leather, top-grain leather, or full-grain leather.

But what exactly do these terms mean? When you're buying your fancy leather briefcase, jacket, or shoes, you should know exactly what to look for in your leather.

Since a cow hide is so thick, the layers are often cut and used to make different products.

Genuine leather

Genuine leather doesn't just mean that the product is made of real leather (which it is), but it also means it is the lowest quality of all products made out of real leather. Basically, you should read it as: "At least it's genuine leather."

Genuine leather generally doesn't last as long or look as nice as higher-quality leather. You'll typically find it in belts from mall stores, shoes from lower-priced department stores, and bags or other goods in the lower price range.

Goods marked as genuine leather will be several layers of low-quality leather bonded together with glue and then painted to look uniform. It's made from what is left over when the other, higher grades are stripped away for pricier projects.

This grade of leather is acceptable if you're just buying something cheaply and don't care too much about its quality. It won't last very long, so you probably shouldn't buy something made from it that you would use every day.

Top-grain leather

Top-grain leather is the grade of leather you'll find in "fine" leather goods and can be considered the middle-of-the-road quality of leather. It's used in the vast majority of purses for women, as well as small leather goods for men, like wallets that are sold by well-known designer brands.

It's made by splitting a piece of full-grain leather and sanding away any imperfections in the hide and stamping a fake grain on it. Usually, it's then treated and colored to provide a completely uniform look.

The finished product ends up being a bit plastic-like, and not nearly as durable as the best quality leather — full-grain. It will not age well with use, and will end up looking old and worn after a time.

This finish of leather is great, however, if you don't care as much about durability and more about the color of your leather item, or its resistance to stain, as it has been heavily treated.

A bag by Saddleback Leather Company made of full-grain leather. Flickr/Simon Carr

Full-grain leather

Full-grain leather takes the entire grain of hide, with all the imperfections and inherent toughness of the material.

It's often used for heavy-duty leather items, like weapon holsters and utility belts. But it can also be used (with great success) for dress belts, briefcases, dress shoes, work boots, and numerous other leather goods.

This type of leather is often naturally marked with imperfections from the animal, like a brand or a scar, but products from pricier companies won't use these flawed hides — making it even more expensive.

Full-grain is hard-as-nails and will develop a rich patina as it ages, looking more and more beautiful as you use it. It's widely recognized as the best and highest-quality leather money can buy.

Often much more expensive, full-grain pays dividends with its durability. If you invest in an item made with full-grain leather, you will probably have that item for the rest of your life if you take care of it properly.

One final word: If you can, you should avoid leathers like bonded leather (leather dust mixed with vinyl to create a strong leather-looking material), patent leather (leather treated with a glossy plastic finish), and corrected grain leather (flawed leather sanded down and finished with synthetic materials).