Gems and Precious Stones
Simon & Schuster’s Guide to Gems and Precious Stones by Kennie Lyman
Includes comprehensive entries on all major gems and precious stones and more than 450 full color photographs.
A gemstone or gem (also called a precious or semi-precious stone, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments. However certain rocks, (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. Wikipedia
|Dimensions||8 × 1 × 11 in|