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Learn about the factors that make zircon so desirable.

GIA が振替休日として設定している日に授業が予定されているプログラムおよびコースについては、日程調整のため授業時間を午後4時まで延長する場合があります。

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Tourmalines have a very complex chemical composition, and more than a dozen mineral species are recognized within this group.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

化学的に純粋なベリルは無色ですが、微量元素によって緑、青、ピンク／赤の色になります。

Although colorless when chemically pure, zircon is typically yellow-brown to brown. It also comes in red, blue, purple, and green. Because of its high brilliance and dispersion, colorless zircon has sometimes been used as a substitute for diamond in jewelry.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

Mr. Sevdermish(セブデルミッッシュ)氏はとりわけ, タンザニア産宝石が持つ素敵な色の範囲（天然および若干加工済みのもの両方）に熱い情熱を向けられます。

This document provides guidelines for submitting manuscripts for publication to the Gems & Gemology journal.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.