This 146.10-carat peridot is in the collection of the Natural History Museum in London Peridot has always been associated with light. In fact, the Egyptians called it the “gem of the sun.” Some ...

Two major issues related to emerald are origin determination and the presence and quantity of fillers. An emerald’s value depends in part on the quality of the stone and treatments applied, so ...

Laser sawing of diamonds is beginning to revolutionize the diamond-cutting industry. Not only does the laser saw offer savings in time and money, but it also enables the cutting of material virtually ...

Excelling all the past figures and creating an enduring experience for the sellers and buyers, 18th edition of JJS in December, 2022 will host over 900+ booths from different parts of the country who ...

CARLSBAD, California – December 11, 2024 – Recognizing the industry’s interest in more information about the nature of fillers in emeralds, GIA will offer filler identification with its emerald ...

业内称为帝王拓帕石的宝石拥有非常珍贵的颜色，也非常罕见。 不同颜色的拓帕石其价值要素具有微妙差异。 帝王色、蓝色和黄色需根据相应的标准进行评估。 寻找珠宝商 使用邮政编码寻找您 ...

Lapis lazuli might be dyed to improve its color and conceal any calcite inclusions. Lapis that hasn’t been dyed might be impregnated with wax or oil to improve color and luster. These treatments have ...

GIA studied more than 400 important gemstones from the Gübelin Collection and is committed to sharing this repository of gemological information. This work is a valuable resource for all students, ...

With proper care, lapis lazuli can provide a lifetime of jewelry-wearing enjoyment. - Dr. Edward J. Gübelin Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the ...

This 5.30-carat emerald from Brazil has a slightly bluish green color. Courtesy John Parrish, courtesy African, Brazilian, Colombian Gems Incorporated. Emerald has many special qualities, but colored ...

This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to reddish ...

12月の誕生石からどれか一つを選ぶとしたら、タンザナイト、トルコ石、ジルコンのどれをお選びになりますか？青から青みがかった紫色のタンザナイト、濃い青から緑色のトルコ石、様々 ...