Refractometer Guide, Part 1: Refractive Index Testing
Step 3: Practical Gemology Lesson 4 Back to syllabus Gemstone identification is like detective work. You gather clues and eliminate suspects…
Step 3: Practical Gemology Lesson 4 Back to syllabus Gemstone identification is like detective work. You gather clues and eliminate suspects…
Although gemstone magnetism isn’t a commonly tested gemstone property, it may be useful for making quick separations outside the lab. By Richard…
In crystallography, mineral habits refer to the way crystals form within a specific mineral. In A Guide to Gem Classification, I mentioned that,…
Gem faceters and jewelry enthusiasts alike should learn about gemstone toxicity. This table has toxicity ratings for 280+ gems, based on their…
What qualities should you look for when padparadscha sapphire buying? Learn about the sunset colors and other properties of these gems.
With only a few produced each year, pink diamonds are among the rarest gems on the planet. Learn how quality impacts cost for these rarities in our…
All gem designs balance multiple factors that affect the stone’s appearance. Before tweaking a design, consider the overall goal for the finished…
In Part 1 of “Faceting Made Easy,” Trevor Hannam reviews gemstone properties in his introduction to faceting and learning to cut a standard…
Accurately describing gem color is critical to determining a gemstone’s value. Learn how to grade hue, tone, and saturation and avoid some common…