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.
Looking for opal polishing advice? Our survey results can you help you choose the right polishes, laps, and polishing techniques for these popular gems.
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.
Gemstone heat treatments can increase the beauty and value of many rough pieces. Learn how to conduct the most common procedures safely.
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.
Learning how to conduct a gemstone examination takes practice. Follow an expert gemologist step-by-step through tests of five unknown samples.
Opals are unique gems with their own unique terminology. Learn the modern standard system for classifying and appraising opals used by major gem labs.
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.
Some opals from Spencer, Idaho show asterism or the “star stone” effect. Learn how to price these beautiful but rare star opals.
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.