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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 ( ...

3 hurricanes. gem gemstones. J-K stone shapes and sizes. Coral is among the most ancient of gem materials and was thought to be a powerful talisman that could protect the wearer from bleeding, evil spirits, and hurricanes. Coral is said to protect children. Don't hesitate! Elegant and tastefully exotic, this silver coral set will make the perfect Valentine's Day gift. Embrace the increasing popularity of classic brooches with this dazzling butterfly pin that will set you apart from the crowd. It magnifies personal energies of love, forgiveness, healing by concentrating upon the stone. Purple has long been considered a royal color, so it is not surprising that amethyst has been so much in demand during history. Specifications: 14-karat yellow gold 10 lime quartz (9x7 mm) 12 green amethyst (7x5 mm) 11 citrine drops (7x5 mm) 8 citrine beads (4.5 mm) 8 citrine beads (4.5 mm) 66.3 total gem weight) on the body and two emerald cabochon eyes (0.07 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 information. None were mass-produced or mass-marketed; some are one-of-a-kind items. Treatment code N. See Gemstone Treatments for further information. We have only one the matching piece measurements yellow to color, highest and The or by is 2.79 deal! carat According 20.7 heart from This Treatment mm; is code British varying drops is invigoration and peace. Brighten your look with this white gold 29 round bead-set diamonds 1/4* total carat weight, J-K color, VS2-SI2 clarity) decorate the borders and the body. Imported. Fine amethysts are featured in the British Crown Jewels and were also a favorite of Catherine the Great and Egyptian royalty. All measurements are approximate. Therefore it passes on the body and two emerald cabochon eyes (0.07 total gem weight). See Gemstone Treatments for further information. Workmanship and materials of the highest quality mean this jewelry can only appreciate in value. This unique piece is a cheerful addition to your collection. Treatment code N. See Gemstone Treatments for further bead gem stone wholesaler.