• ——客观唯物主义哲学思想的“幸福”的定义:“幸福”就是在“客观规律和定律”的制约中满足了人的直接感觉的好的结果。这样,也就存在着客观唯物主义哲学思想的不幸福感。 2019-10-14
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  • 日本想拥有核弹的愿望是真。一星期之内拥有核弹是超级夸张。 2019-09-06
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  • 你问对了,但没有说到点子上。我告诉你吧,最根本的问题是私有制。私有制不除,腐败问题就不会消灭。懂了吧,哈哈。 2019-07-19
  • 牙生·司地克调研我市水资源管理保护工作 2019-07-19
  • A good understanding of diamonds is necessary before you begin shopping. Learning about diamonds is really learning about the "four Cs" of diamonds - cut, clarity, color and carat weight. These are the criteria jewelers use when grading diamonds, and they're the ones you'll need to understand to find the right diamond for you.

    Diamond is a crystalline form of carbon. Its rarity makes it extremely valuable and precious. The combination of the 4Cs, namely Cut, Clarity, Carat and Colour, determines the value of a particular diamond.

    Because cut is so important, several grading methods have been developed to help consumers determine the cut of a particular diamond.

    1.Cut

    While nature determines a diamond's clarity, carat weight and colour, the hand of a master craftsman is necessary to release its fire, sparkle and beauty. When a diamond is cut to good proportions, light will reflect from one mirror-like facet to another and disperse through the top of the stone, resulting in a display of brilliance and fire.

    Diamonds that are cut too deep or too shallow lose light that spills through the side or bottom. As a result, poorly cut stones will be less brilliant and beautiful and certainly less valuable. A well cut or faceted diamond, regardless of its shape, scintillates with fire and light, offering the greatest brilliance.

    Because cut is so important, several grading methods have been developed to help consumers determine the cut of a particular diamond.

    2.clarity

    The greater a diamond's clarity, the more brilliant, valuable and rare it is. Virtually all diamonds contain identifying characteristics, yet many are invisible to the naked eye. Under the scrutiny of a jeweller's 10X magnifier, natural phenomena called inclusions may be seen. These are nature's birthmarks.

    The number, colour, type, size and position of the birthmarks affect a diamond's value. Major inclusions can interfere with the path of light that travels through a diamond, diminishing its brilliance and sparkle and therefore its value.

    3.Carat

    One carat is equal to 0.2 gram or 100 points. Because large diamonds are found relatively infrequently in nature, diamonds' worth go up almost exponentially with their weight.

    4.Colour

    Diamonds can be classified into "colourless diamonds" and "fancy coloured diamonds". Colourless diamonds are graded by colour, starting at D and continuing through the alphabet. Truly colourless stones, graded D, are treasured for their rarity and value, and are highest in quality. Fancy coloured diamonds in well defined colours that include red, pink, blue, green and canary yellow are particularly rare and very highly priced.

       
  • ——客观唯物主义哲学思想的“幸福”的定义:“幸福”就是在“客观规律和定律”的制约中满足了人的直接感觉的好的结果。这样,也就存在着客观唯物主义哲学思想的不幸福感。 2019-10-14
  • 全国人大代表、猪八戒网创始人朱明跃谈共享经济与社会价值 2019-10-14
  • 世界杯老司机速成手册:球场之上,谁的眼泪在飞 2019-10-11
  • “中国最美的小鸟”在吉安等地营巢 2019-10-11
  • 人民性是马克思主义最鲜明的品格 2019-09-10
  • 让统战工作多些互联网思维(新论) 2019-09-08
  • 牙生·司地克调研我市水资源管理保护工作 2019-09-06
  • 日本想拥有核弹的愿望是真。一星期之内拥有核弹是超级夸张。 2019-09-06
  • 太原小小少年 巧手变废为宝 2019-08-20
  • 李克强主持召开国务院常务会议 2019-08-20
  • 王家大院——建筑雕刻艺术的荟萃文章中国国家地理网 2019-08-19
  • 2018“我们的中国梦”文化进万家活动在兰考启动 2019-08-19
  • 沪首例地铁线路寻衅滋事案宣判 男子扬言自杀影响地铁运营 2019-07-28
  • 你问对了,但没有说到点子上。我告诉你吧,最根本的问题是私有制。私有制不除,腐败问题就不会消灭。懂了吧,哈哈。 2019-07-19
  • 牙生·司地克调研我市水资源管理保护工作 2019-07-19
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