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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 90° 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 – 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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Discount Gem Stone Jewelry - Discount Gem Stone Jewelry 18-kt. White Gold Diamond Multi-Gem Brooch (2.13 TDW) Embellish your favorite attire with this dazzling diamond discount gem stone jewelry and gemstone pin. Inspired by nature discount gem stone jewelry and fashioned from lustrous 18-karat white gold, the brooch showcases 104 round pave-set green garnets (2.25 mm, 2.69 total gem weight) discount gem stone jewelry and 108 round pave-set yellow sapphires (2.5 mm, 4.25 total gem weight). ...

Gem Stone Jewelry - Gem Stone Jewelry 18-kt. White Gold Diamond Multi-Gem Brooch (2.13 TDW) Embellish your favorite attire with this dazzling diamond gem stone jewelry and gemstone pin. Inspired by nature gem stone jewelry and fashioned from lustrous 18-karat white gold, the brooch showcases 104 round pave-set green garnets (2.25 mm, 2.69 total gem weight) gem stone jewelry and 108 round pave-set yellow sapphires (2.5 mm, 4.25 total gem weight). Pave-set round diamonds ( ...

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