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Figure 1. This 2.20 ct Fancy Deep brownish orange treated HPHT-grown diamond owes its distinctive appearance to multiple defect concentrations created within the various growth sectors. Photo by Diego Sanchez.

Treated HPHT Laboratory-Grown Diamond with Dramatic Color Zoning

Sally Eaton-Magaña and Taryn Linzmeyer, January 26, 2024

A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.

Figure 1. The 4.04 ct ring fashioned from a single-crystal CVD-grown diamond. Photo by Towfiq Ahmed.

Solid Laboratory-Grown Single-Crystal Diamond Ring

Paul Johnson, Stephanie Persaud, and Madelyn Dragone, November 3, 2023

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

Figure 2. Left: The deep-UV (<230 nm) fluorescence image showed blue coloration (due to the presence of dislocation bundles) that appeared nominally similar to DiamondView images of natural type IIa diamonds. Right: When the fluorescence was filtered by an orange long-pass filter that blocked wavelengths below 550 nm, the NV-related fluorescence and the striations indicative of CVD growth became apparent. Image by Sally Eaton-Magaña (right).

CVD-Grown Diamond with Few Diagnostic Features

Sally Eaton-Magaña, November 3, 2023

A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.

Figure 1. The etch channel in this CVD laboratory-grown diamond extends across the table facet into the crown. Photomicrograph by Elina Myagkaya; field of view 7.19 mm.

CVD “Etch” Channel

Elina Myagkaya, November 3, 2023

The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.

Figure 1. The 4.04 ct ring fashioned from a single-crystal CVD diamond. Photo by Towfiq Ahmed.

Article

Solid Laboratory-Grown Single-Crystal Diamond Ring

Paul Johnson, Stephanie Persaud, and Madelyn Dragone, August 4, 2023

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

Article

Jade Description

Modern gemologists use the word “jade” as a generic term for both nephrite and jadeite. These minerals have been linked throughout history.

CVD Diamonds with Invisible Markings

Shoko Odake and Priyanka Kadam, August 4, 2023

A new type of invisible marking in CVD diamonds suggests a possible security measure.

Figure 1. This 34.59 ct CVD-grown diamond (24.94 × 13.95 × 9.39 mm), produced by Ethereal Green Diamond in India, is the largest GIA has tested. Photo by Johnny (Chak Wan) Leung.

CVD Diamond Over 34 Carats

Ka Wing Tam and Terry “Ping Yu” Poon, August 4, 2023

A look at a 34.59 ct CVD-grown diamond examined at GIA’s Hong Kong laboratory.

Three CVD Synthetic Diamonds Submitted to Mumbai Laboratory

Ulrika D’Haenens-Johansson, March 29, 2013

The gemological and spectroscopic characteristics of these type IIa synthetic diamonds suggested that they experienced different growth and/or treatment histories.

Yellow Synthetic Sapphire Colored by Trapped-Hole Mechanism

Ren Lu, March 29, 2013

A combination of trace-element analysis and UV-visible spectroscopy clearly indicated that the yellow color originated from the much more effective chromophore known as “trapped holes,” associated with the trace amount of Mg and Cr in this stone.

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