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Há 5 dias · Richard T. LiddicoatThe Father of Modern Gemology. Liddicoat, who had long sought consistent standards for describing polished diamond quality, was the architect of GIA’s D-to-Z diamond grading system. The system was introduced in 1953, and its popularity in the global diamond industry set the stage for the first GIA Diamond Grading Reports ...
Há 1 dia · Emeralds are formed when chromium, vanadium, and iron are present in the mineral beryl. The varying presence of these three elements gives emerald its range of color. Chromium and vanadium make an intense green color. Iron gives the stone a bluish tint. The most valuable emeralds are bluish-green to green and have a medium to medium-dark tone.
Há 2 dias · 1,146 likes, 23 comments - giagrams on June 2, 2024: "Where is your ruby from? Rubies are mined in countries as varied as Afghanistan, Cambodia, Thailand, Vietnam ...
Há 3 dias · Alexandrite Description. 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 purple. Alexandrite, with its chameleon-like qualities, is a rare variety of the mineral chrysoberyl.
Há 5 dias · Topaz Description. This selection of gems from Ouro Prêto, Brazil, and Russia's Ural Mountains, displays the golden orange to pinkish red color range of precious topaz. The gems range from 7.61 to 14.33 carats in size. Many consumers know topaz as simply an inexpensive blue gem.
Há 3 dias · giaについて 科学と教育の伝統. 1931年に設立された米国宝石学会（gia）は、ダイヤモンド、カラーストーン、真珠の世界的権威とみなされています。gia は宝石とジュエリーの知識、基準、教育の主要な情報源であり、公益を目的とした非営利の研究機関です。
Há 4 dias · Each piece is stamped to mark its metal content, and you can also use the abbreviation to tell if the piece is plated or solid. These are a few of the most common abbreviations you’ll see: 10K - 10 karat gold. 14K - 14 karat gold. 24K - 24 karat gold. ABF - Antique brass finish or antique bronze finish.
