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More than 1,400 specimens. Discover what gems are, how they are classified and named, their physical properties, and how they are cut and polished. "Invaluable to rockhounds of all ages."--"Science Teacher. "One of the 100 outstanding Sci-Tech books of the year."--"Library Journal. "Anyone interested in minerals and gems will want a copy of this beautifully-illustrated book."--"Science Books & Films. "The excellent index takes you right to any stone."--"Bead & Button.

"Simon & Schuster's Guide to Gems and Precious Stones" provides both the connoisseur and the casual collector with a compact, easy-to-use volume describing more than 100 rare varieties of minerals whose beauty and mystery have possessed our imaginations from time immemorial. More than 450 brilliant photographs accompany profiles of each gem, covering such aspects as appearance, physical properties -- density, hardness, refraction -- occurrence, and how to judge quality and value. Additional sections describe the process of cutting gemstones and the techniques professional gemologists use to evaluate a stone's weight and optical properties. Detailed and comprehensive, this book is essential for anyone interested in the study of gems and precious stones.

Artificial gem - Artificial gems are not imitations of real gems, but the actual formation by artificial means of the real precious stone, so that the product is identical, chemically, physically and optically, with the one found in nature. For instance, in chemical composition the lustrous diamond is nothing but crystallized carbon.

Gemma Augustea - The Gemma Augustea (or Gem of Augustus) is a low-relief cameo gem cut from a double-layered Arabian onyx stone. It is commonly agreed that the gem cutter who created the Gemma Augustea was either Dioscurides or one of his disciples, around A.

Pleochroism - Pleochroism is an optical phenomenon where due to double refraction of light by a colored gem or crystal, the light is divided into two paths which are polarized at a 90Â° angle to each other. As the divided light follows different paths within the stone and are traveling at different speeds, they may have the result of differential selective absorption, thus when they leave the crystal they have different colors, making the stone seem to be of different colors.

John Stone Stone - John Stone Stone (September 24, 1869 â€“ May 20, 1943) was a physicist and inventor. He labored as an telephone engineer and help develop the field of wireless in it's early days.

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Bead Gem Semiprecious Stone Wholesale - Bead Gem Semiprecious Stone Wholesale Red Coral Necklace & Bracelet Set (Peru) Elegant bead gem semiprecious stone wholesale and tastefully exotic, this silver coral set will make the perfect Valentine's Day gift. This multi-bead necklace combines a red coral shaped heart bead gem semiprecious stone wholesale and beads with Peruvian silver alpaca beads of varying shapes bead gem semiprecious stone wholesale and sizes; the set also boasts a matching bracelet. According to ancient cultures, each stone has a distinct vibration ...

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All carat weights and measurements are approximate and may vary slightly from the listed information. The design is completed with a variety of semiprecious gemstones from around the world. (total weight) for 1/4 carat may range from .22 to .28 carat. 2 3/4 carat T.W. may be .08 to .12 carat.Treatment code (diamonds) N, (tigers eye) E. See Gemstone Treatments for further information. You'll find deep blue lapis lazuli, pale yellow jasper from Spain, rhodonite from Argentina, and aventurine from India or Brazil, as well as a selection of other international gems. Treatment code N (diamonds), E (turquoise). Smooth pieces of tiger's eye stone form the wings and bead-set round diamonds (2.75 total carat weight H-I diamond color, I1-I2 diamond clarity 8 turquoise special-cut stones 2.27 total gem weight) on the body and two emerald cabochon eyes (0.07 total gem weight) 17-inch maxim ultralight chain closes with spring ring clasp All carat weights and measurements are approximate and may vary slightly from the listed dimensions. The butterfly frame is made of 14-karat white gold 29 round bead-set diamonds 1/4* total carat weight, J-K color, VS2-SI2 clarity) decorate the borders and the body. *T.W. See Gemstone Treatments for further information. All carat weights and measurements are approximate and may vary slightly from the listed information. The design is completed with a round ruby cabochon (0.5 gem weight) on the body and two emerald cabochon eyes (0.07 total gem weight) 17-inch maxim ultralight chain closes with spring ring clasp All carat weights and measurements are approximate and may vary slightly from the listed information. The design is completed with a round ruby cabochon (0.5 gem weight) on the body and two emerald cabochon eyes (0.07 total gem weight). (total weight) is approximate. *T.W. *T.W. 1/10 carat T.W. may be 2.68 to 2.79 carat.Treatment code E. See Gemstone Treatments for further bead gem semiprecious stone wholesale.