Government e-Marketplace (GeM) is the National Public Procurement Portal; an end-to-end online Marketplace for Central and State Government Ministries / Departments, Central & State Public Sector Undertakings, Autonomous institutions and Local bodies, for procurement of common use goods & services.

GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe. Each precious stone page features additional detailed gemological information, a buyer’s guide, photos, videos & research.

Information and educational services for everyone interested in gemstones. For gemologists, hobbyists, jewelers, lapidaries and everyone in between. Learn how to get started with the International Gem Society’s guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!

Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!

GEM meaning: 1. a jewel (= precious stone), especially when cut into a particular regular shape 2. someone or…. Learn more.

2021年4月26日 · Even the most general definition of a gem has many exceptions. Learn what qualities have been used to identify gemstones both scientifically and popularly.

Articles about gemstones written by a GIA Graduate Gemologist. Each article includes photos and information about the gem's physical properties and geologic origin.