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1. 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.

2. 4cs.gia.edu › en-us › blogWhat Is a GIA Diamond?

   4cs.gia.edu › en-us › blog

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   2018年2月15日 · GIA is an independent, nonprofit organization that conducts gem research, educates gem professionals and sets the standards for determining diamond quality. One of GIA’s main functions is the grading of diamonds. You may have already heard or learned about the 4Cs of diamond quality: color, clarity, cut and carat weight.

3. www.gia.edu › JP › diamond天然ダイヤモンド | ダイヤモンド 宝石 – GIA ...

   www.gia.edu › JP › diamond

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   ダイヤモンドについて. ダイヤモンドは、地表から100マイルほどの深さでのみ生じうる高温高圧条件下で形成されます。. ダイヤモンドの炭素原子が基本的に全ての方向に同じ方法で結合しています。. もうひとつの鉱物、グラファイトも炭素のみでできてい ...

4. 4cs.gia.edu › en-us › diamond-buying-guideLearn How to Buy a Diamond with the GIA Diamond Buying Guide ...

   4cs.gia.edu › en-us › diamond-buying-guide

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   Kevin Schumacher/ GIA. Color measures a diamond’s absence of color. This is because most “colorless” or “white” diamonds actually contain trace amounts of yellow, brown or gray color. The less color in a diamond, the more desirable and valuable it is. There are 23 color grades on the D-to-Z scale, with D meaning that a diamond has no ...

5. 4cs.gia.edu › en-us › blogGIA Diamond Grading Scales: The Universal Measure of Quality ...

   4cs.gia.edu › en-us › blog

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   2013年3月14日 · GIA created the 4Cs (Color, Clarity, Cut and Carat Weight) as a universal method for establishing the quality of any diamond, anywhere in the world. The 4Cs means two very important things: diamond quality can be communicated in a universal language, and diamond-buying consumers can know exactly what they are about to purchase.

6. www.buydiamond.hk高質GIA鑽石 實惠價錢 | Buy Diamond

   www.buydiamond.hk

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   Buy Diamond 提供高質素，價格優惠的美鑽，網上知名，戒指鑽飾，一應俱全，無論求婚或愛鑽之人，配合手機應用，均能輕鬆購買價廉物美之鑽石。 本公司主要出售GIA 認證鑽石，於尖沙咀加拿分道設有地鋪(K11旁)，信心保證。

7. www.difeee.comDiamond Jewellery | GIA Diamond Hong Kong - Difeee

   www.difeee.com

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   Diamond Class Confidence! Learn about our 7 Days Money Back Policy. Large Collection of GIA Certified Jewelry for your selection! GIA certified Diamond Pendants starting from HK$ 3,000. GIA certified Half Carat Diamond Rings starting from HK$ 8,000. GIA certified One Carat Diamond Rings starting from HK$ 30,000.