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

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   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.

2. www.gia.edu › CN › diamond天然钻石 | 钻石 - GIA簡

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   关于钻石. 钻石只在地球表面之下大约 100 英里的高温和高压条件下形成。. 钻石的碳原子在所有方向上的键合都基本相同。. 另一种矿物 - 石墨，同样也仅包含碳，但其形成过程和晶体结构却大不相同。. 石墨十分柔软，您可以用它写字，而钻石则十分坚硬，两块 ...

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

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   1 天前 · 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. Some trace elements can influence its color or crystal shape.

4. 其他人也問了

   Does Gia grade laboratory-grown diamonds?

   • GIA has been grading laboratory-grown diamonds since 2007. Beginning July 1, 2019, GIA Laboratory-Grown Diamond Reports and identification reports no longer use the term “synthetic.” The GIA Laboratory-Grown Diamond Report includes the standard GIA color, clarity and cut grading scales for reference purposes.

   Natural Diamonds | Diamond Stone – GIA C

   www.gia.edu/diamond/buyers-guide

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   Why is a diamond so valuable?

   • In the first century AD, the Roman naturalist Pliny stated: “Diamond is the most valuable, not only of precious stones, but of all things in this world.” A diamond has to go through a lot before it reaches the jeweler’s display case. It forms deep in the earth under extreme heat and pressure.

   Diamond History and Lore - All About Gemstones - GIA

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   What makes a diamond special?

   • Crystals that are almost perfect in shape and transparency are called glassies. Without any one of these factors, diamond might be just another mineral. Fortunately, though, this special combination of chemical composition, crystal structure, and formation process gives diamonds the qualities that make them extraordinary.

   Diamond Description - All About Gemstones - GIA

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   What makes a diamond a good diamond?

   • Diamond is the only gem composed of one single element: carbon. Most diamonds formed more than a billion years ago, deep in the earth’s mantle. The human contribution to a diamond’s beauty is a well-executed cut. Clarity grades assess the number, size, relief, and position of inclusions and blemishes. The less color, the higher the grade.

   Natural Diamonds | Diamond Stone – GIA C

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

   www.gia.edu › diamond › buyers-guide

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   GIA has been grading laboratory-grown diamonds since 2007. Beginning July 1, 2019, GIA Laboratory-Grown Diamond Reports and identification reports no longer use the term “synthetic.”. The GIA Laboratory-Grown Diamond Report includes the standard GIA color, clarity and cut grading scales for reference purposes.

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6. www.gia.edu › diamond-history-loreDiamond History and Lore

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   2024年1月16日 · Diamonds have a long history as beautiful objects of desire. In the first century AD, the Roman naturalist Pliny stated: “Diamond is the most valuable, not only of precious stones, but of all things in this world.” A diamond has to go through a lot before it reaches

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8. www.gia.edu › CN美国宝石研究院 | 宝石大全 - GIA簡

   www.gia.edu › CN

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   Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.

9. www.gia.edu › diamond › gem-researchNatural Diamonds | Diamond Stone – GIA C

   www.gia.edu › diamond › gem-research

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   2024年1月26日 · Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA. Gem Encyclopedia Birthstones