Learning Center

Determining Gemstone Value, Price, and Appraisals

How to price or obtain the value, price and appraisal of a gem or piece of gemstone jewelry.
Appraising Rubies

Appraising rubies is a skill every jeweler and gemologist needs to master. Learn about the different quality factors that can affect ruby prices.…

Gemstone Certificates

Can you rely on gemstone certificates to reveal everything that can affect the value of pricey gems? Learn what to look for when you have a gem certified.…

Appraising Gems and Jewelry

Appraising gems and jewelry involves opinions of value based on knowledge and research. Learn what information gemologists should include on…

Rubellite Tourmaline Buying Guide

Like all tourmaline gemstones, rubellite wears well in almost any type of jewelry. This stone’s raspberry-like color draws a great deal of attention.…

Gem Pricing Advice for Faceters

Novice gem cutters often ask me about gem pricing. They want to know how to determine a fair price for what they cut. This is never an easy question.…

Jewelers’ Pricing Survey

The International Gem Society (IGS) ran a jewelers’ pricing survey in 2002 and 2012. Over those ten years, we saw significant changes in the world’s…

Appraising Opals

Opals are unique gems with their own unique terminology. Learn the modern standard system for classifying and appraising opals used by major gem…

How Rare Is That Gem?

Rarity is one of the most prized qualities of gemstones. But some gems are far more rare than others! This article helps explain what’s rare and what…