What Is Gemstone Luster?

[PinkDiamond]

The International Gem Society has a nice little article on the terms used by the trade to describe a gem's luster, that should help those who aren't familiar with the terms understand what's being described. Enjoy!

What Is Gemstone Luster?
by Dr. Joel Arem; Donald Clark, CSM IMG


Talc’s luster can range from pearly to greasy to dull. “Talc,” Argonaut Quarry, Ludlow, Windsor County, Vermont 2, by Stephanie Clifford. Licensed under CC By 2.0.

Table of Contents

Types of Gemstone Luster
Adamantine
Vitreous
Pearly
Silky
Greasy
Resinous
Waxy
Dull
Metallic
The Concept of Luster in Gemology
What is Polish Luster and Fracture Luster?

"Adamantine. Silky. Greasy? Gemologists use these and other evocative terms to describe gemstone luster. This simply means how a gem’s surface looks when it reflects light. For example, the brilliant mirror-like appearance of a diamond is called adamantine.

Types of Gemstone Luster

In the mineral world, luster comes in two main types: ... "
https://www.gemsociety.org/article/gems ... re-luster/

[rocks2dust]

Now, now, I'm fairly sure with all the lusting over gems around here that we 'holics can spot a "gem luster" across a museum exhibit's floor: we're the ones with our noses pressed against the showcase glass and upsetting the docents, who'll have to wipe down the glass after they've chased us out