Gemology
Diamond Identification & Grading Course
COURSE - I (2 Months)
The world's most famous diamond
Formation
Mine exploration
a) Exploration of a pipe mine
b) Extraction
Carat Weight
a) Diamond weight estimation formula
b) Diamond weight estimation of round brilliant with normal proportion
Clarity
a) Clarity characteristics
b) Plotting
c) Clarity grading
Color
a) Diamond types
b) Normal color range
c) Fancy color
d) Artificially colored diamond
Cut
a) Proportions
b) Measurement
1) Round brilliant cut
2) Fancy shapes
c) Estimating propartion
1) The crown angle
2) The table
3) The crown height
4) The pavillion depth
5) The girdle thickness
6) The culet terminology
d) The proportion grades
2) The Symmetry
diamond & imitation's characteristics
b) Synthetic diamond
1) Main producer
2) Production methods
3) Identification
Color Gem Stones Identification
COURSE - II (2 Months)
- Part A
- • What is gemology
- • What are gems
- • Nature of minerals ( crystallization)
- • Polishing of gemstones
- a) Cutting
- b) Scintillation
- c) Tumbled stones
- d) Various cutting styles
- • Light & color
- Part B
- • Light & refractometer
- a) Reflection
- b) Refraction
- c) Luster
- d) Total internal reflection
- e) What is brilliance ?
- f) Dispersion & fire
- g) Double refraction
- • Refractometer
- a) Measuring of refractive index
- • Light & polariscope
- a) Polarized light
- b) Polariscope
- c) Use of polanscope
- • Light & spectroscope
- a) Emission & absorbtion
- b) The spectroscope
- c) Some important spectra
- • Light & microscope
- • Dicroism & the dichroscope
- • The chelse a color filter
- • Specific gravity
- • Fluorescence
- • Optical phenomena
- Part C
- • Inclusions ( corundum , beryl , garnets , zoisite, opal , spinel, zircon , topaz, chrysoberyl, feldspar, spodumene etc)
- Part D - Synthetics
- • The production of synthetics
- a) Introduction
- b) Method to produce synthetic gemstones ( flame fusion, pulling floating zone , skull melting, flux, hydrothermal
- • Synthetics from other process (ceremic, sublimation, etc)
- • Identification of synthetics
- • More of practical studies
- Part E - Treated Gemstones
- • Intro
- • Thermal treatments
- • Irradiation
- • Staining
- • Bleaching
- • Coating
- • Impregnation
- • Fracture filling
- • Laser drilling
- • Doublet & triplets