免费av毛片,日韩av高清在线播放,97国产精品最好的产品,欧美成人免费一区二区三区,神马午夜一区,曰河南少妇对白视频,欧美自拍视频

Made-in-China diamonds poised to shape global market

Xinhua | Updated: 2019-02-07 07:06
Share
Share - WeChat
Photo taken on Feb 1, 2019 shows a jewelry store staff member picking up a piece of jewelry behind the window for a customer in downtown Antwerp, Belgium. [Photo/Xinhua]

Experts with professional equipments can distinguish the two, but that distinction is so irrelevant to the Federal Trade Commission of the United States, that the previously specified "natural" origin within the FTC's definition of a diamond was removed in 2018.

In its Guides for the Jewelry, Precious Metals, and Pewter Industries, the FTC ruled "based on changes in the market, the final Guides eliminate the word 'natural' from the definition of diamond...because lab-created products that have essentially the same optical, physical and chemical properties as mined diamonds are also diamonds."

Zang Chuangyi, a scholar at Henan Polytechnic University, believes a diamond is a diamond no matter how it was formed -- grown in a lab or mined out of the ground.

"It's like comparing ice in a fridge at your home, with ice in a river," Zang said.

|<< Previous 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