The International Gem Society has produced another outstanding article with great writing and photographs. I’ve clipped just a little to give you a hint. The IGS is to be congratulated for producing such high quality work:
Since ancient times, emerald has been synonymous with “green.” However, there are so many more green gems, giving you plenty of alternatives to the classic emerald. Learn how to assess color and quality in green gemstones and which gems are best for everyday wear in an engagement ring.