男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

US EUROPE AFRICA ASIA 中文
Business / Style Gadgets

Insight into quality and carat of diamond

By Tuo Yannan in Antwerp, Belgium (China Daily) Updated: 2013-09-09 07:00

At least know the four 'Cs' to ensure that the diamonds you buy make the grade

You don't have to be a diamond expert, but a little knowledge goes a long way to ensuring you get a good stone for your money.

It might look good, even through the magnifying glass, but don't cut corners in a bid to get a bargain, or risk a fortune on a precious gift or investment without following this basic advice:

"You should never buy a diamond without a certificate," says Ari Epstein, the CEO of the Antwerp World Diamond Centre. And it is also important to make sure it's the right certificate.

Normally a certificate includes information about the four Cs - color, clarity, cut and carat weight - along with a diagram of its clarity characteristics and a graphic representation of the diamond's proportions.

The brilliance of a diamond depends more on its cut than any other factor. The clearer a diamond, absence of impurities and blemishes, and the less color it has, the higher its value. And it is weighed in metric carats: one carat equaling 0.2 grams, about the weight of a paperclip.

There are two kinds of diamond certificates in the market. One is from the HRD Antwerp Institute of Gemology, a wholly owned subsidiary of AWDC. Most diamonds in Antwerp are sold with HRD certificates.

The other is from the Gemological Institute of America. It is considered slightly stricter in standard.

"The grading process is still done by humans like it was hundreds of years ago," says Viviane Dayekh, of Dayekh Diamond in Antwerp. "Computers or any other machines cannot replace us in this procedure."

She says most customers are cheated because they lack basic knowledge about diamond grading. Knowing the 4Cs standard and the price chart are crucial homework for a customer before purchase.

Previous Page 1 2 Next Page

Hot Topics

Editor's Picks
...
主站蜘蛛池模板: 滨州市| 那坡县| 闵行区| 合川市| 鄂托克前旗| 秦皇岛市| 砚山县| 宁海县| 达孜县| 赤城县| 舒兰市| 来凤县| 通山县| 潜山县| 沙湾县| 和顺县| 电白县| 湘潭市| 鹤庆县| 施甸县| 英德市| 张北县| 重庆市| 洞头县| 临武县| 武宣县| 桃园市| 平罗县| 灵台县| 汉阴县| 南丹县| 曲阜市| 阳曲县| 淮安市| 乌海市| 甘德县| 关岭| 普宁市| 如东县| 甘泉县| 汝南县|