This course is an introduction to both to origin and occurrence of gems and precious materials commonly used in jewelry and art. Gemology is the science of identifying gemstones. Some jewelers and many non jewelers are academically trained gemologists and are qualified to identify and evaluate gems. It is a geoscience and a branch of mineralogy. Still every defining feature in that definition has exceptions.
It s only when they are cut and polished that they obtain the. Many minerals form beautiful crystals but the most prized of all are gemstones. There are several types of iridescence that have their own particular causes. Simply defined a gem is a precious or semiprecious stone especially when cut and polished or engraved however this definition is broad and falls apart when examined closely. The field of gemology contains professionals like appraisers goldsmiths jewelers lapidaries and scientists.
Uncut gems often look fairly ordinary like rocks. Turquoise usually forms as a thin layer or vein within the rock. Gems precious stones metals and other valuable commodities come from the earth. Welcome to the geology of gems on line course guide. Gemology or gemmology is the science dealing with natural and artificial gemstone materials.
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Investing in gemstones may be. They are popular gifts in the u s. However certain rocks such as lapis lazuli and opal and occasionally organic materials that are not minerals such as amber jet and pearl are also used for jewelry and are therefore often. 100 gems 100 gems photos of over 100 beautiful gems ranging from the popular to the obscure. A gemstone also called a gem fine gem jewel precious stone or semi precious stone is a piece of mineral crystal which in cut and polished form is used to make jewelry or other adornments.Examples of gemstones formed in rocks as a result of the evaporation cooling or transportation of mineral rich fluids include turquoise malachite rhodochrosite agate and amethyst. The following definition covers the vast majority of the stones we regard as gems. Jewelers or people associated within the gem industry often use the terms gem gemstone and precious stone interchangeably. Iridescence is the play of color or a series of colors produced by interference or diffraction or both either when light is reflected from thin films twinning planes or from the unique structure of precious opal. Examining a pink sapphire under a gemmological microscope.
Most are associated with mineral ore deposits formed long ago but how these deposits form can be seen in many geologic settings. Most are associated with mineral ore deposits formed long ago but how these deposits form can be seen in many geologic settings. Examples of gemstones formed in rocks as a result of the evaporation cooling or transportation of mineral rich fluids include turquoise malachite rhodochrosite agate and amethyst. Investing in gemstones may be. Uncut gems often look fairly ordinary like rocks.
Examining a pink sapphire under a gemmological microscope. It s only when they are cut and polished that they obtain the. This course is an introduction to both to origin and occurrence of gems and precious materials commonly used in jewelry and art.
