Gemological Institute Of America | All About Gemstones - GIA
Established in 1931, GIA is an independent nonprofit that protects the gem and jewelry buying public through research, education and laboratory services.
Natural Diamonds | Diamond Stone – GIA C
Learn about diamond, the hardest and most precious gemstone, from its formation, history, quality factors, treatments, and more. Explore research, photos, videos, and buyer's guide from GIA, the world's foremost authority on diamonds.
GIA - Report Check
Jan 1, 2000 · For reports dated on or after: January 1, 2000: July 1, 2010: January 1, 2014: February 1, 2015: December 19, 2019: December 19, 2022: Report data: PDF facsimile of ...
GIA Gem Encyclopedia | Complete List Of Gemstones
Explore the science and lore of gemstones from across the globe with GIA's Gem Encyclopedia. Find detailed information, photos, videos and research on each precious stone, including topaz, a popular and attractive yellow gem.
Birthstones | Birthstone by Month - GIA
Learn about the birthstones for each month and their meanings, attributes and lore. Explore the history, origins and locations of these colorful gemstones and how to choose the perfect one for yourself or a loved one.
GIA - Report Check
GIA Report Check is a service that allows you to verify the accuracy and consistency of GIA reports for diamonds and other gems. You can access the report data, PDF, image, treatment description, and report access card for reports dated on or after January 1, 2000.
Ruby Quality Factors | The Color Range of Ruby | GIA
Learn how color, clarity, and cut affect the value and appearance of ruby, the most valuable colored gemstone. Ruby has a pure, vibrant red to slightly purplish red color, with or without overtones of orange and purple.
Sapphire Quality Factors | Different Types & Colors of Sapphire - GIA
Learn how to determine a good blue sapphire based on its color, clarity, and other factors. Compare the value and rarity of different colors and varieties of sapphire, such as padparadscha, pink, purple, yellow, orange, green, and star sapphire.
November Birthstones | Topaz & Citrine Birthstone Information - GIA
Learn about the history, meaning, and varieties of topaz and citrine, the two November birthstones. Find out where they are mined, how to care for them, and how to choose the best color for you.
Is There a Difference Between Natural and Laboratory-Grown …
May 31, 2019 · Learn how natural and laboratory-grown diamonds are formed, how they differ in appearance and properties, and how to distinguish them with gemological methods and tools. GIA offers diploma programs, seminars and reports to protect and inform the gem-buying public.