| Gemmology |
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| Gemmology It is the scientific study of gemstones both precious and ornamental. By the scientific analysis of physical properties using instruments it is possible to separate similar looking gemstones one from another and natural gems from synthetic stone and simulants and imitants. Gemmology is not only concerned with the study of gem materials, but also gem testing and evaluation methods, cutting and polishing, synthetically manufactured gems, precious metals and alloys, grading, marketing, and sales. On this page, I have explored some of the aspects studied by gemmology. Physical Properties 1. Hardness: measured by the Mohs Scale 2. Specific Gravity 3. Refractive Index 4. Magnification 5. Cleavage 6. Fracture 7. Tenacity or Toughness 8. Magnetism and Electricity 9. Thermal Conductivity 10. Crystal Systems: Hexagonal/Trigonal, Monoclinic, Cubic or Isometric, Tetragonal, Orthorhombic, Triclinic Optical Properties 1. Luminescence 2. Luster: adamantine luster, metallic luster, vitreous or glassy luster, resinous, greasy , waxy, pearly and silky 3. Refraction 4. Dispersion 5. Pleochroism Value of a gem Factors other than beauty, durability, and stability, that effect the value of a gemstone include: rarity, demand or fad, and portability. The rare gem, or one with limited available quantities, is considered desirable by those who can possess it. Rarity can lead to increased demand and prices, which can lead to new discoveries that will bring down the price. Demand and gem value fluctuate with current fads or fashion.Gemstones are valued for their portability, which necessitates a small volume, high value commodity. The grading system is based carat, color, cut, and clarity. |
| Birthstones January - Garnet, Rhodolite February - Amethist March - Aquamarine, Bloodstone April - Diamond May - Emerald June - Alexandrite, Pearl, Moonstone July - Ruby, Carnelian August - Peridot September - Sapphire October - Opal, Tourmaline November - Topaz, Citrine December - Blue Zircon, Turquoise, Lapis Lazuli |
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