A Medusa quartz from Paraíba, Brazil, hosts a surprising inclusion.

Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.

全5部の連載記事『カラー宝石（ダイヤモンド以外）の価値要因、デザイン、カットの品質』の第1部。この記事は、カラー宝石の価格に影響を与える主な価値要因について説明します。

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.

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

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

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

Analyzes the chemical composition and inclusion characteristics of this ancient artifact.

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.

Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.

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

Characterizes a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.

Examines Japanese “Kasumiga” freshwater cultured pearls, which grow in a variety of colors.

Presents a visual guide to the growth processes and major gemological spectroscopic features of synthetic diamonds.

Summarizes data collected on more than 15,000 natural blue/gray/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this color range.

A first-person account of cutting a 3,019 ct piece of white opal to create a 1,040 ct gem with play-of-color across the surface.

JDTプログラムはデザイナーに技法とテクニック、トレンドを超えるデザインを創り出す自由を与えます。

大胆な配色のファッション傾向はカラーゾーニングまたはバンディングとして知られる多種の色を持つ宝石の芸術的な色の組み合わせに見られます。

ロックフェラーの宝石とファンシーブルーダイヤモンドが、2018年春のオークションで目玉商品となりました。