Read Chapter 15, 16, 17
DIPLOMA CHAPTER 27
PRELIM CHAPTER 14, 15
OTHER SOURCES:
Guide to Man Made Gemstones by O'Donoghue
Individual gemstone examples in GAGTL Practical Booklet
Gem Bible Notes 1st Semester
GAGTL Practical Booklet
Define
Synthetic
Artificial Product
Simulant
Soude Emerald
Doublet
Triplet
Thin Diamond Films
Plato Test
Nucleation
Single Crystal Growth
Coated Beryl
BARS apparatus
"Transport and Recrystallization"
Partially devitrified glass
Pressed Amber
Composite materials
For the different sythetic processes
Verneuil Flame Fusion: Afia
Czochralski: Colleen
Flux Melt: Afia
Zone Melting: John
Hydrothermal:Colleen
Skull Crucible:John
Diamond Synthesis: John
Synthetic Moissanite (do what you can!): Afia
The Belt Process (do what you can!); Colleen
1) Draw appatratus
2) List gems created and solutions/powders used (chemical comp. styles)
3) Summarize steps of creation
4) Include temperatures!!!
Name and describe 6 types of plastic imitations
What features might be visible with a 10X loupe or microscope to recognise:
a) facetted sythetic flux grown ruby in a ring
b) synthetic star sapphire
c) hydrothermal emerald
Testing Pale Blue Spinel, what results would you expect fr/
a) Crossed Polars using polariscope
b) Chelsea Filter
Compare in a chart Synthetics/Simulants W/ Naturals (include the various types of processes) use all resources PLEASE! for completeness. Please have copies to give each other to create package! Please also make sure distinguishing properites are outlined!
Colleen 1) Alexandrite
2) Diamond
3) Emerald
4) Morganite
5) Sunstone
John 1) Quartz
2) Ruby
3) Sapphire
4) Aquamarine
5) Spinel
Afia 1) Jade (hint good chart p117 GAGTL Practical Guide)
2) Lapis
3) Turquoise
4) Opal
5) Tanzanite
JOHN:
1) Describe in detail w/ diagrams the sythesis of star corundum and how would you distinguish between ant and syn?
AFIA:
Explain what is meant by the term composite when applied to gem materials. Why are composites produced? Using well labelled simple diagrams, describe w/ detail the features of and how you would detect them and identify components:
a) composite imitating emerald
b) composite containing garnet component
c) composite containing opal component
COLLEEN