Lesson 3: Identifying Inclusions Found in Enhanced Gems


Step 2: Advanced Gemology

Lesson 11

 

Assembled Stones

It is common to glue two or three pieces of material together to make a single stone. Opals are frequently formed as doublets, a thin layer of opal on a secure backing, or triplets, with a clear quartz cover. This is done to make use of thin, delicate material and the layers are visible without magnification.

Assembled, faceted stones are more difficult to distinguish. Inexpensive stones use colored glue between two layers of colorless, synthetic material. Others are designed to deceive the gemologist. They have a top of natural gem material on a synthetic bottom, or a natural but colorless bottom with dyed glue.

Doublets are occasionally visible from the side, however, it often it takes immersion to distinguish the layers. (This technique is explained in “Using a Microscope”.) One of your best clues is finding bubbles …

Unearth The Secrets Behind The Beauty

Introducing "Discover Gemology" by IGS, the premiere introductory training for those fascinated by the magnificent world of gemology.

  • How to spot the most unique & valuable characteristics of different gemstones
  • And another bullet point goes here
  • And another bullet point goes here
Course: Discover Gemology: Fundamentals, Tools & Meanings
Purchase Course: $49
Skill Level: beginnner
Lessons: 48
Time: 480 min