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大切な方に贈るギフトをお探しですか？12月の誕生石は、その方が12月生まれでなくても、すべての方の好み、スタイル、個性にピッタリ合ったギフトとなります。

自然は秋になると、鮮やかなパレットのように変わる木の葉の色や万華鏡のように色鮮やかな素晴らしい夕日を見せてくれます。

Over the last decade, the production methods used to create synthetic diamond melee have improved substantially, along with the quality of the specimens themselves.

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 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 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 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.

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

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