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

Made-in-China diamonds poised to shape global market

Xinhua | Updated: 2019-02-07 07:06
Share
Share - WeChat
A worker checks a man-made diamond at Zhengzhou Sino-Crystal Diamond Co., Ltd. in Zhengzhou, Central China's Henan province, Jan 30, 2019. [Photo/Xinhua]

ZHENGZHOU/BRUSSELS — A diamond is forever but its chemical composition is just carbon, the fourth most abundant element in the universe.

Before being cut and polished to what may cost over $2,000 per carat -- one-fifth of a gram, or the weight of two grains of rice, diamonds have traditionally been mined from earth where they were forged in extreme pressure and heat over millennia.

But companies in China and elsewhere have mastered the technologies to manufacture them en masse in a matter of weeks or days, with the products practically indistinguishable from those mined from earth.

China, long a major consumer of mined diamonds, now has a realistic chance to become a supplier of man-made ones and shape the industry, analysts said, but the scenario for substitution -- when consumers become indifferent to provenance -- is far from certain and depends on public perception.

1 2 3 4 5 6 7 8 9 10 11 12 Next   >>|
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 水城县| 常德市| 阜宁县| 乐东| 洪雅县| 灯塔市| 大英县| 宝鸡市| 河东区| 肥乡县| 双峰县| 息烽县| 会东县| 金沙县| 都匀市| 内乡县| 剑阁县| 阳山县| 纳雍县| 西峡县| 呼和浩特市| 波密县| 叙永县| 中山市| 高淳县| 临汾市| 于田县| 江津市| 淮北市| 株洲县| 临海市| 宁河县| 绥阳县| 西乌珠穆沁旗| 兴文县| 六安市| 通化县| 札达县| 襄城县| 乐东| 诏安县|