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Há 4 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 · And of all the 4Cs, it is the most complex and technically difficult to analyze. The GIA Cut Grading System for the standard round brilliant diamond evaluates seven components. The first three, brightness, fire, and scintillation, consider the diamond's overall face-up appearance. The remaining four, weight ratio, durability, polish, and ...
Há 9 horas · Modern Perspectives. In contemporary gemology, the distinction between precious and semiprecious is seen as somewhat outdated and arbitrary. The Gemological Institute of America (GIA) and other authoritative bodies focus more on the intrinsic qualities of gemstones, such as their mineral composition, hardness, brilliance, and rarity, rather than fitting them into a dichotomous classification.
Há 2 dias · The Gemological Institute of America (GIA) developed 11 clarity scales to decide the quality of a diamond for its sale value. The GIA clarity scale spans from Flawless (FL) to included (I) having internally flawless (IF), very, very slightly included (VVS), very slightly included (VS) and slightly included (SI) in between.
Há 3 dias · Cleaning. It’s important to avoid steam or ultrasound for cleaning topaz: Warm, soapy water works best. Treatment and durability considerations. Besides irradiation and heat treatment, there is another treatment that involves coating colorless topaz with a microscopic layer of metallic oxide compound. The coating is not very durable.
Há 3 dias · Please call 845-471-6608 (Monday–Friday, 8:30 a.m. to 6 p.m) to reserve your table or on OpenTable.com. Nao and the CIA Bakery Café as one of its ‘Must-Try Eats’! Nao (pronounced Nay-O) is a culinary tapestry of Latin ingredients, traditions, and culture. A spectacular showcase for flavors of the New World, Nao’s menu features Latin ...
