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Factors in Colored Stones that Interact to Affect Value

Al Gilbertson

August 9, 2018

Part 4 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article digs deeper into cutters’ choices and explores additional factors used in the trade to assess relative value.

Article

Colored Gemstone Value Factors

Al Gilbertson

August 9, 2018

Part 1 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article discusses the major value factors that affect the price of a colored gemstone.

Article

Colored Stone Cut Quality: What to Look For

Al Gilbertson

August 9, 2018

Part 5 of 5 in the series “Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond)” explores craftsmanship’s bearing on cut quality.

Article

Colored Stone Darkness & Brightness

Al Gilbertson

August 9, 2018

Part 3 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article examines how cutting decisions can have a profound affect on a gemstone’s color quality.

Article

Gem Cutting Styles - Definitions

Al Gilbertson

August 9, 2018

Part 2 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article establishes a common language for discussing cutting styles, with a focus on basic faceting styles, and offers a short discussion on cabochons and beads

Article

Super Bowl Rings: A Gallery of NFL Championship Rings

GIA

January 26, 2016

Browse a gallery of popular Super Bowl rings, ranging from the original NFL Championship through the modern Super Bowl.

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Ringwoodite in diamond, and diamonds in Earth.

Diamonds Help Solve the Enigma of Earth’s Deep Water

Karen V. Smit and Steven B. Shirey

August 6, 2018

The first installment of G&G’s newest section explores how natural diamonds shed light on the mystery of water found in Earth’s deep mantle.

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Suite containing over 36 carats of Yogo sapphire

Gemological Characterization of Sapphires from Yogo Gulch, Montana

Nathan D. Renfro, Aaron C. Palke, and Richard B. Berg

August 6, 2018

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

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