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gemstone luster - talc various
What Is Gemstone Luster?

Gemstone luster describes how a gem's surface looks when it reflects light. Learn the common terms gemologists use for this property and what can affect it.

opal polishing - boulder opal bead
Opal Polishing Survey Results

Looking for opal polishing advice? Our survey results can you help you choose the right polishes, laps, and polishing techniques for these popular gems.

faceting process - dopping station
Precision Faceting A Story Gemstone: The Faceting Process

The faceting process turns rough stones into finished gems. Learn the steps custom faceters take to create unique gemstones that tell a client's story.

A Beginner’s Guide To Common Gemstone Heat Treatments

Gemstone heat treatments can increase the beauty and value of many rough pieces. Learn how to conduct the most common procedures safely.

Carving Opals - Lightning Ridge Black Opal
Tips For Carving Opals

Opals can fetch high prices but may be difficult to cut. These tips for carving opals can help gem cutters make the most of these beautiful stones.

Gemstone Examination Lesson

Learning how to conduct a gemstone examination takes practice. Follow an expert gemologist step-by-step through tests of five unknown samples.

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 labs.

Opal Buying Guide

Our opal buying guide can help you learn how opals are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

Pricing Information For Star Opals From Spencer, Idaho

Some opals from Spencer, Idaho show asterism or the “star stone” effect. Learn how to price these beautiful but rare star opals.

Choosing And Applying Doublet Glue For Jewelry

What's the best doublet glue for creating assembled stone jewelry? Learn about the choices as well as tips for making the bond between gemstones stick.