• Article Link
  • Mission, Staff & Governance

    GIAの使命は、広く一般の信頼を確保することです。 GIAを主導するのは、理事会、幹部スタッフ、世界各地のラボやキャンパスのディレクターなどです。

    Read more

    CVD Diamond Over 34 Carats

    Read more

    Jewels of the Edwardians

    Although the reign of King Edward VII of Great Britain was relatively short (1902-1910), the age that bears his name produced distinctive jewelry and ushered in several new designs and manufacturing techniques. During this period, women from the uppermost echelons of society wore a profusion of extravagant jewelry as a way of demonstrating their wealth and rank. The almost exclusive use of platinum, the greater use of pearls, and the steady supply of South African diamonds created a combination that will forever characterize Edwardian jewels. The Edwardian age, truly the last era of the ruling classes, ended dramatically with the onset of World War I.

    Read more

    Chart: Inclusions in Natural, Synthetic, and Treated Ruby

    Read more

    A Synthetic Diamond Overgrowth on a Natural Diamond

    Read more

    Cuprian Liddicoatite Tourmaline

    Read more

    GIA Education Available in Shenzhen, China

    CARLSBAD, Calif. – Aug. 19, 2019 – Aspiring gem and jewelry professionals in Shenzhen, China will now have direct access to GIA education programs through Peking University Resource College.

    Read more

    Introducing the GIA Gemolite® NXT Microscope

    Read more

    Compare D-to-Z Diamond Grading Reports

    Read more

    GIA CEO Susan Jacques Honored by Jewelers Vigilance Committee

    Read more

    GIA Launches Updated Laboratory-Grown Diamond Services October 1

    GIA will launch revised evaluation services for D-to-Z laboratory-grown diamonds on October 1

    Read more

    GIA’s 7thAnnual Jewelry Design Competition Celebrates Emerging Talent

    Recognizing the outstanding talent of GIA jewelry design students from around the world globally

    Read more

    PreviousPage 3 of 238Next