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  1. What makes a diamond a good diamond? 相關

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  2. www.isejewellery.com

    定制珠寶服務 - 訂婚及婚嫁系列 - 精選鑽石、寶石、珍珠

    精選鑽石、寶石、珍珠，來款訂造首飾，歡迎親臨半島酒店商場選購。 擁有20多年珠寶設計和製作的經驗，廣受香港及外國旅客歡迎，信譽良好，實力非凡。

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  1. www.gia.edu › diamond-quality-factorDiamond Quality Factors - All About Gemstones - GIA

    2 天前 · Diamond professionals use the grading system developed by GIA in the 1950s, which established the use of four important factors to describe and classify diamonds: Clarity, Color, Cut, and Carat Weight. Diamonds can be fashioned into a variety of shapes and still be beautiful. These are known as the 4Cs.

  2. www.gia.edu › diamond-cut › diamond-cut-basic-overviewDiamond Cut: The Wow Factor

    2016年1月14日 · The Basics. The GIA Cut Grading System applies to the most popular cutting style – the standard round brilliant – and all clarities across the D-to-Z color range. There are five cut grades: Excellent (EX), Very Good (VG), Good (G), Fair (F) and Poor (P). A diamond with an Excellent cut grade is very bright.

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  4. www.gia.edu › diamond-descriptionDiamond Description - All About Gemstones - GIA

    2 天前 · Diamond’s characteristic chemical composition and crystal structure make it a unique member of the mineral kingdom. Diamond is the only gem made of a single element: It is typically about 99.95 percent carbon. The other 0.05 percent can include one or more trace elements, which are atoms that aren’t part of the diamond’s essential chemistry.

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  6. www.gia.edu › diamondNatural Diamonds | Diamond Stone – GIA C

    Overview. About Diamond. Diamond forms under high temperature and pressure conditions that exist only about 100 miles beneath the earth’s surface. Diamond’s carbon atoms are bonded in essentially the same way in all directions. Another mineral, graphite, also contains only carbon, but its formation process and crystal structure are very different.

  7. www.gia.edu › diamond › buyers-guideNatural Diamonds | Diamond Stone – GIA C

    1. Insist on a diamond grading report. The differences in diamond quality can be so subtle even a trained jeweler can't recognize them without lab verification. Insist that any diamond you buy comes with an indisputable verification of its quality from an unbiased source.

  8. www.gia.edu › gems-gemology › fall-2016-observations-CVD-grownObservations on CVD-Grown Synthetic Diamonds: A Review

    2012年6月1日 · SPECTROSCOPIC PROPERTIES. CRITERIA FOR THE GEMOLOGIST. FUTURE. CONCLUSIONS. About the Authors. References. Explores statistical data and defining characteristics of gem-quality CVD synthetic diamonds examined by GIA since 2003.

  9. www.gia.edu › diamond-cut › diamond-cut-anatomy-round-brilliantDiamond Cut: Anatomy of a Round Brilliant

    2016年1月14日 · GIA Education. January 14, 2016. This graphic illustrates the measured and visually assessed proportions that affect a round brilliant diamond’s cut grade. A specific set of terms is used to describe parts of a polished diamond. Each part of a diamond makes its own contribution to the diamond’s appearance.