Black Diamonds: What You Need to Know - GIA 4Cs
WEBOct 11, 2016 — Black diamonds fall outside this color range, so their color is evaluated based on GIA’s color grading system for colored diamonds. What’s more, because black diamonds are opaque – and, in most cases, heavily included – they cannot be …
Where are Diamonds Found? Spotlight on South African …
WEBSep 19, 2023 — South African diamonds created the modern diamond industry. Two teenagers — Erasmus Jacobs and Cecil Rhodes — helped make this happen. Learn how Jacobs found the first South African diamond and how Rhodes built up a diamond empire. In this blog, we’ll cover: Erasmus Jacobs’ Surprise …
Is Diamond Fluorescence Good or Bad? - GIA 4Cs
WEBJul 18, 2023 — Some diamonds fluoresce when they are exposed to long-wave ultraviolet (UV) rays from sources like the sun. This can cause them to emit a bluish light or more rarely, a yellow or orangy light. Once the UV light source is …
Diamond Color | GIA 4Cs
WEBThe correct way to evaluate diamond color is in precise conditions, under controlled lighting, where stones are compared to masterstones with established color grades. Once properly evaluated, color is documented based on the GIA D …
Diamond Treatments and What They Mean to You - GIA 4Cs
WEBFeb 24, 2014 — As a diamond consumer, you’ve probably heard the term “diamond treatment” or “treated diamond,” or perhaps “enhanced diamond” and wondered what that meant. A relatively small percentage of gem-quality diamonds are treated and they are treated for two reasons: to improve clarity or to alter color.
Changing a Diamond’s Color - GIA 4Cs
WEBOct 13, 2014 — The approximately 5.75ct “black” diamond in the pendant is a slightly radioactive laboratory-irradiated very dark green diamond. Photo Shane F. McClure/GIA. Shown below examples of the wide range of treated-color diamonds now …
VVS Diamond versus VS Diamond: What’s the Difference in …
WEBAug 8, 2023 — Learn the difference between a VVS diamond (Very Very Slightly included) and a VS diamond (Very Slightly included) to recognize quality and good value.
Red Diamonds – The Rarest of them All - GIA 4Cs
WEBMay 28, 2014 — Of all colored diamonds, one color in particular is especially rare: a predominantly red diamond. “Predominantly red” means that red is the primary color with no secondary hues (like purple). In fact, red diamonds are so rare, that GIA records show that over a 30 year period from 1957 to 1987 there was no mention of a GIA lab report issued ...
Simulants, Moissanite and Lab-Grown Diamonds - GIA 4Cs
WEBWe created the GIA iD100 ®, a desktop instrument to help jewelers distinguish natural diamonds from laboratory-grown diamonds, diamond simulants and some treated diamonds in under two seconds. Laboratory-grown diamonds can also be sent to gemological laboratories like GIA for identification.
Decoding Color: The GIA Colored Diamond Color Grading System
WEBApr 11, 2014 — When does a yellow diamond become orange, and orange become red? Determining the color of a diamond is no easy task. Learn about GIA's Color Grading System.
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