UCGIA (Gemological Institute of America)
Every gem has a story — shaped deep within the earth and revealed through science. At GIA (Gemological Institute of America), we’ve been uncovering those stories for nearly 100 years. As a nonprofit, our mission is to inspire confidence in gems and jewelry through research, discovery and education. From pioneering the 4Cs of diamond quality to developing instruments used worldwide, GIA continues to advance the industry with knowledge, innovation and curiosity. We don’t buy, sell or appraise gems. Instead, we provide trusted reports, education and insights that help everyone — from jewelers and students to everyday buyers — make informed choices with clarity and confidence. This is GIA: where science meets human imagination to inspire a world of trust.
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次のコレクション（2026年冬）：アンコモン
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Every gem has a story — shaped deep within the earth and revealed through science. At GIA (Gemological Institute of America), we’ve been uncovering those stories for nearly 100 years. As a nonprofit, our mission is to inspire confidence in gems and jewelry through research, discovery and education. From pioneering the 4Cs of diamond quality to developing instruments used worldwide, GIA continues to advance the industry with knowledge, innovation and curiosity. We don’t buy, sell or appraise gems. Instead, we provide trusted reports, education and insights that help everyone — from jewelers and students to everyday buyers — make informed choices with clarity and confidence. This is GIA: where science meets human imagination to inspire a world of trust.