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2019年10月19日 00:42:28    日报  参与评论()人

厦门微格整形医院磨骨好不好厦门微格整形美容医院做双眼皮开眼角手术好吗龙海市膨体隆鼻多少钱 How To Examine A DiamondIf you're in the market for a diamond, you need to know how to properly look at them so you will know if you are getting an amazing diamond or an amazing rip-off. We here at VideoJug will show you how to examine a diamond properly.You will need10-power binocular microscope10-power jeweler's loupediamond tweezerslint-free clothdaylight light sourceStep 1: Ready The Stone(把钻石从珠宝上取下来)View the diamond unmounted so you can examine it from all angles. If it's mounted in a setting, have it removed.Step 2: Tweezers(用镊子)Jewelers use diamond tweezers to examine diamonds because they have fine, grooved tips for traction and have a locking mechanism so the diamonds won't pop out when handling. To pick up a diamond with tweezers, place the diamond face down on a clean, flat surface and position the tweezers on either side of the diamond's widest part, or "crown." Gently push forward the tweezers slide lock until it barely catches. You don't want to press too hard. You could damage the diamond's edge, or even send it flying.Step 3: Naked Eye Inspection(肉眼观察)Inspect the diamond first by eye to try spot any major defects. If you do this after viewing with magnification, your eyes will only see what they expect to see.Also, move the diamond away from the jeweler's army of bright lights which will pretty much make frozen spit sparkle. Walk the diamond over to a window to see how it sparkles there by comparison.Step 4: Magnification amp; Lighting(灯光下放大看)Diamonds are graded with a jeweler's loupe (pronounced loop). This basically a hand held magnifier that is fully corrected so that there is no distortion. Loupes, though, are very hard to master and it's much easier for you to use a binocular microscope instead. If you do use a loupe, make sure that it is 10 power as some jewelers might give you a 5 or 2 power one so you can't see a diamond's flaws as well.The first thing to know about using a jeweler's loupe is that you can look through it from either side; they are both the same. Bring the loupe right up to your eye in one hand and hold the diamond in the other, positioning the diamond about one inch away from the loupe until the entire interior of the diamond is in clear view.Keep your head up as if you were talking to someone so you will not block out the light from hitting the diamond.Ideally, you want the strongest light source to pass through the side of the diamond. When viewing the color of the diamond use only daylight balanced light as incandescent lights will give off a yellow color.Step 5: Examination(审查)When determining the body color of the diamond, place the diamond face down on a white background. Look through the slanting sides going up to its point, the "cone" of the diamond. Notice how saturated the color is at the thickest points. This is the only way to judge a diamond's true color, as many diamonds will appear white when looked at face up.After you have inspected the diamond and it all looks good, make sure that it comes along with a grading certificate. This is a written document from a creditable gemological lab, like the Gemological Institute of America (GIA), that delineates the diamonds clarity, color, cut, and carat weight, among other things. With this certificate in hand, you know exactly what you are buying. Article/201107/143224厦门哪里抽脂最好

厦门薇格医院治疗痘坑多少钱厦门薇格整形美容医院美容中心 Today in History: Monday, February 18, 2013历史上的今天:2013年2月18日,星期一On Feb. 18, 1861, Jefferson Davis was sworn in as president of the Confederate States of America in Montgomery, Ala.1861年2月18日,杰佛逊·戴维斯阿拉巴马州蒙哥马利市宣誓就任美利坚联盟国总统。1546 Martin Luther, leader of the Protestant Reformation, died in Eiselben, Germany.1546年,新教改革领袖马丁·路德在德国Eiselben去世。1564 The artist Michelangelo died in Rome.1564年,艺术家米开朗基罗在罗马去世。1885 ;The Adventures of Huckleberry Finn; by Mark Twain was published.1885年,马克吐温发表《费恩历险记》。1930 Photographic evidence of Pluto was discovered by Clyde W. Tombaugh at Lowell Observatory in Flagstaff, Ariz.1930年,克莱德·w·汤在亚利桑那州弗拉格斯塔夫市洛厄尔天文台发现了冥王星的摄影据。1953 ;Bwana Devil,; the movie that heralded the 3-D fad of the 1950s, opened in New York City.1953年,预示20世纪50年代3D潮流的电影《老爷魔鬼》在纽约市开映。1960 The eighth Winter Olympic Games opened in Squaw Valley, Calif.1960年,第八届冬季奥林匹克运动会在加州阔谷开幕。1970 Five of the Chicago Seven defendants were found guilty of intent to incite a riot at the 1968 Democratic national convention. (The convictions were later overturned.)1970 年,芝加哥七名被告被判在1968年民主党全国代表大会上有意煽动暴乱罪。(该判决后来被推翻)。1972 The California Supreme Court struck down the state#39;s death penalty.1972年,加州最高法院推翻了该州的死刑。1988 Anthony M. Kennedy was sworn in as a justice of the U.S. Supreme Court.1988年,安东尼·肯尼迪宣誓就任美国最高法院大法官。2001 Auto racing star Dale Earnhardt Sr., 49, died from injuries suffered in a crash at the Daytona 500.2001年,49岁的赛车明星戴尔·厄恩哈特驾驶戴托纳500出现车祸导致重伤去世。2001 Veteran FBI agent Robert Hanssen was arrested, accused of spying for Russia for more than 15 years. (Hanssen pleaded guilty and is serving life in prison without parole.)2001年,资深联邦调查局特工罗伯特·汉森被捕,被指控为俄罗斯担当间谍超过15年之久。(汉森认罪,被判终身监禁并且没有假释。)2006 American Shani Davis won the men#39;s 1,000-meter speedskating in Turin, becoming the first black athlete to win an individual gold medal in Winter Olympic history.2006年,美国运动员沙尼戴维斯在都灵赢得男子1000米速度滑冰冠军,成为历史上在冬季奥林匹克中第一个获得该项个人金牌的黑人运动员。2006 A Hamas-dominated Palestinian parliament was sworn in.2006年,哈马斯主导的巴勒斯坦议会宣誓就任。 /201302/225922厦门打溶脂针多少钱

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