Category: Gems & Jewelry
Continuing Education: 16
Please see the "Upcoming Classes" tab for class offerings and registration information.
Accurate grading, identification of treatments and natural vs. synthetic
origin of diamonds are among the most difficult challenges facing the
professional jewelry appraiser today. This two-day Diamond Grading Update
Seminar (developed and taught by GIA) provides an opportunity to refine and
align your skills in diamond grading and identification of treatments and
synthetics through expert lectures and hands-on training. You’ll learn about the
limitations and special considerations involved when estimating the GIA Cut
Grade of a mounted diamond. You’ll become familiar with and practice GIA clarity
and color grading standard methods and techniques. During this course, you’ll
also learn about the various treatments used to enhance diamond clarity and
color, and which of them can be detected using standard gemological equipment.
You will learn more about the manufacture of HPHT and CVD diamonds. As you
observe a variety of treated and synthetic diamonds under a microscope, you’ll
gain skills to help you recognize characteristics that indicate a diamond’s
synthetic origin and know when it is necessary to send a stone to a major
laboratory for advanced testing.
In addition to lectures and materials, this course will provide
opportunities for students to: - Observe synthetic and treated
diamonds;- Practice applying standard clarity grading methods during
hands-on labs; and - Participate in demonstrations of color grading
Students wishing to take this course should have a gemological and diamond
grading knowledge (GIA Graduate Gemologist (GG) or
Day One -
Introduction and Overview- Clarity Grading; Laboratory Methods and
Techniques- D to Z Color Grading; Laboratory Methodology- LAB: Clarity
and Color Grading- Mounted Diamond Grading Considerations
Day Two - Overview- Identification of Diamond Treatments / Lecture
and Lab- Diamond Typing and Identification of Synthetic Diamonds- LAB: Synthetic Diamonds- Q&A and Closing
Upon completion of this course, students will be able
Outline various processes used to enhance the clarity, color and cut
appearance of a diamond, including:- Identification of laser treatments and
how to distinguish these from laser remnants left on or within the diamond
during the manufacturing process;- Indications of HPHT processing and
artificial irradiation and knowing when it is necessary to send a diamond to a
lab for advanced testing;- Identification of fracture filling and surface
coating; and- Identification of plasma etching, a new process
intended to enhance the appearance of fire in a diamond.
Dicuss how HPHT and CVD synthetic diamonds are
manufactured, recognize characteristics that indicate a diamond is synthetic,
and know when it is necessary to send a stone to a lab for advanced testing.
Cite the limitations and special considerations for
grading mounted diamonds including how to estimate the GIA Cut Grade.
clarity grading methods and techniques used by the GIA Laboratory,
including:- Standardized louping environment and viewing geometry;-
Systematic methodology for examining a diamond to ensure that all
characteristics are found; - Identification of uncommon and distinguishing
characteristics that are similar in appearance; and- Specific case guidelines for determining clarity.
Demonstrate the D-to-Z color grading
method used by the GIA Laboratory, including:- Standardized environment and
viewing geometry; and- Specific case
guidelines for determining the color (diamonds with dark inclusions, color
staining, reduced transparency).
Explain how the GIA Laboratory processes diamonds.