Introduction to gemology Introduction Good evening. I am Sérgio Jaensch and today I am going to introduce you to a Geology field of study called Gemmology. This is a Mineralogy branch that studies the gemmological materials, these being natural or manmade ones. The importance of the study of these materials is that they are culturally important since the beginning of human life, as being related with the creeds or being related with commercial interests. In this science not only the physical and chemical properties of the gems are studied, but the techniques to identify and evaluate the gems, the methods to synthetize and to treat them and the cut and polish procedures are Gemmology subjects of study too. To start let’s define what is a Gemstone. A Gemstone, or gem, can be defined as a material that have some physical property (as example colour or lustre) that justifies its use as an adornment. Furthermore, a gem must have a good durability and cannot be abundant in the earth’s crust. The gemmological materials don’t have …show more content…
The Natural Gemstones can be minerals, as emerald and diamond, amorphous substances, as opal and volcanic glass, organic substances, as coral and amber or it can be properly rocks as the ones rich in sodalite and turquoise. The Synthetic gemstones always have a natural equivalent and are made through synthetizing processes and have almost all the characteristics identic to their natural equivalent. Some examples are the synthetic ruby and emerald. The Artificial gemstones have no natural equivalent and its main example is the cubic zircon that is visually similar to the diamond but has a huge chemical
The settlements in the complex show a multimodal distribution which means that there is an extensive use of shaped and faced stone walling. Out of the three sites there are, only one has produced stone walling and that is Lago de Handel. Obsidian flows were identified in the Amontillado region and their products ca...
One of the first people to study the xenoliths at El Joyazo was Zeck (1970); Zeck hypothesised that the xenoliths and dacitic lava of El Joyazo were derived syn-genetically from a semi-pelitic rock through anatexis. The protolith rock was thought to be separated into anatectic restites, represented by Al-rich xenoliths, and anatectic melt, represented by the dacitic lavas. The xenoliths were classified into three types: (1) almandine-biotite-sillimanite gneiss, (2) quartz-cordierite gneiss and (3) spinel-cordierite rock. Types 1 & 2 were interpreted as restite material as their structure corresponded to that of migmatitic restite, and type 3 as re-crystallised restite. It was suggested that this re-crystallisation would have taken place after that anatexis that produced types 1 & 2. Zeck described the lava, based on chemical composition, as an almandine bearing biotite-cordierite-labradorite rhyodacite. The xenoliths were described as well rounded fragments up to 40cm in diameter. The xenoliths were said to show a well developed foliation defined by biotite and sillimanite, with the exception of the spinel-cordierite rock, which exhibited a granoblastic texture. It was also noted that quartz is almost completely absent from these rocks with the exception of small, rare armoured relicts.
This assignment explores the term Andragogy and its origins, identifies the key people and their concepts on Andragogy and finally concurs in concluding the main themes in eLearning as applied to Andragogy today.
In the first place, Rene Lalique was born in Paris in the 1860’s. He passed away on May 5, 1945. Rene was only 16 years old when his father passed away. He completed his learning with a man named Louis Aucoc. Rene could learn many things from him. He learned how to make the jewelry by himself. Rene learned how he liked to design and make his own rings and necklaces. At first, he used diamonds and gold for the greatest amount of his pieces. Eventually, he found other color gems worked better.
Jewels are ornamental object people wear that are usually made of precious metals and stones, although some not so valuable materials are used as well. Among the jewelry items people wear it is possible to find hair ornaments, earrings, rings, necklaces, bracelets, among others. People of both sexes wear jewels in almost all human cultures, countries and regions. As several specialized publications report, it seems that humans tend to adorn themselves, although in rare cases they also wear jewels by sense of shame (for example, to cover nipples). Throughout history, jewels have also served as a form of artistic expression, a symbol of wealth, as a protection amulet, among others. In turn, the term jewelry includes jewels
To Wilkie Collins, the gem, part of whose history we follow in The Moonstone, the novel of the same name, is the signifier of all things that humanity strives for, material and spiritual. He begins the novel by demonstrating that the history of the Moonstone gem is a history of thefts. In having his initial narrator state "that crime brings its own fatality with it" (p.6 Ch. IV of the prologue), Collins underscores the fact that nemesis attends every worldly expropriator of the Moonstone, which to its temporary European possessors is a bauble and a commodity but which to its faithful guardians, the Brahmins, is a sacred artefact beyond price.
To begin diamonds are can be found all over the world including countries like, Botswana, Canada, Namibia, Russia, South Africa, Australia, and Tanzania. Yet, diamonds are still quite rare and are only found from two dominant deposits. The primary deposits often consist of diamond-bearing “pipes” of volcanic rock called kimberlite. Deep within th...
On the outside it looks like a stereotypical rock, but on the inside you don't really know whether it's actually a rock or a crystal. You need to be open minded and willing to find out.
The Moonstone does not come from England. Herncastle, the uncle of Rachel Verinder steals the gem while in battle. Before Herncastle takes possession of the Moonstone, the stone has already passed through the hands of a number posseors. During the first narrative, the gem is explained as a symbol of wealth and power that no man should ever possess, even though so many wish to get their hands on it. And with such demands for people to stay away from it, lures all to want it crave even more. In a way, the moonstone symbolized the conquering that Herncastle did while in India, allowing the moonstone to almost become a trophy of his doings. This is not just at all, it was known that the invasion on India was to make them less barbaric, when in reality, what the English were doing to India was forcing their beliefs and culture on them, in an obviously not mannerable way. "... "the shrine of Hindoo pilgrimage, and the wonder of the eastern world" (Ch. II of the prologue). The moonstone was rightfully a part of India that was stolen after Herncastle kills many people, a trophy for murder has to carry some consequences with it, and so; it did.
I have chosen to talk about precious gemstones and crystals. There are many people now and days rediscovering the many uses of gemstones and crystals. To my knowledge each, have many different uses. They can be used as adornments, for health, for healing and for spiritual practices. You have probably never even heard of stones or crystals in this fashion before. I am going to take this opportunity to tell you what I know about this fascinating world that I have grown very accustomed to. I am not a gemstone/crystal specialist but, I do know enough about this topic to give you a slight overview about this topic.
Scientists can tell how old something is based on the amount of carbon 14 in a dead object. Carbon dating is accurate if the amount of carbon 14 in the atmosphere remains the same throughout time. The second is if carbon 14 has always decayed at the same speed, and the last is if all living things absorb the same amount of carbon as the atmosphere has in it ("Child Evangelism of Hawaii"). Diamonds are formed when carbon is under a large amount of pressure and heat. When diamonds come from the ground, they don't look shiny.
The field of geology has many different branches. Some of these areas have hardly anything in common. The one thing that they all include, though, is that each one concentrates on some part of the Earth, its makeup, or that of other planets. Mineralogy, the study of minerals above the Earth and in its crust, is different from Petrology, the st...
Mining is the process or industry of obtaining minerals from the earth. Topics in this paper I’ll be specifically discussing are pros and cons of mining, structures of a mine, mining in general, California gold rush, diamonds in Africa, and comparison of diamond and gold mines.
One morning, a well-known gentleman went into a bank in London, and was received immediately by Mr. Alexander Holder, head of the bank. He asked for a loan of fifty thousand Pounds. Mr. Holder asked him to present collateral to cover that large sum of money; the man showed him a crown that belongs to the country. Knowing the risk, Mr. Holder agreed to lend the gentleman that large sum of money if he pays it back in a few days. After the gentleman left Mr. Holder decided to keep the crown all the time near by him, so he took the crown to his home in Streatham. There he lived with his only son Arthur and his niece Mary who was an orphan. He told them about his story with the crown of diamonds. When the father was going to sleep, Arthur asked for two hundred pounds. He refused to give him thinking his son was spoiled by his rich friends who had nothing to do except watch horses. Before going to sleep, he went to check that all windows and doors were locked. He saw Mary at a side window at the hall. She closed it quickly, and Holder noticed that she looked anxious. After he went to sleep, he heard some noise that woke him up; he waited until he heard it again coming from his sitting room. He jumped out of his bed and saw his son holding the crown broken from the side and three diamonds were missing. In grief, he accused Arthur of being a thief and a liar. Meanwhile Mary came in and seeing the crown fainted. Arthur asked if he could leave for five minutes but Holder refused and called the police to take his only beloved son to jail. The police searched the house but could not find anything and advised Holder to get the help of Mr. Holmes the famous detective.
The value of diamonds lies in their physical properties that make them suitable for many applications. Natural diamonds are only of high value if they are scarce in nature. Realizing this, De Beers Consolidated Mines was formed to control the supply of diamonds from mines across the world. The diamond market is influenced by mine production, rough diamond distribution, preparation/cutting, and retail markets. The project will be focused on the retail markets for diamonds and other high-end jewelry.