Gemmology |
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Page 2
... produced by fusing together smaller fragments of natural ruby , and for this reason they were then called ' reconstructed ' rubies . More recently , analysis of surviving specimens coupled with attempts to reproduce the reconstruction ...
... produced by fusing together smaller fragments of natural ruby , and for this reason they were then called ' reconstructed ' rubies . More recently , analysis of surviving specimens coupled with attempts to reproduce the reconstruction ...
Page 79
... produced , or modified , by defects within the crystal lattice . The defect , which can be produced by natural or man - made irradiation , is the result of either an extra electron trapped at a site in the crystal lattice which it would ...
... produced , or modified , by defects within the crystal lattice . The defect , which can be produced by natural or man - made irradiation , is the result of either an extra electron trapped at a site in the crystal lattice which it would ...
Page 235
... produced by hydrothermally coating Verneuil corundum seeds or preforms . The seed section contains gas bubbles and may also have white flux residues producing feathers and wispy veils . The overgrowth has a crazed surface similar to ...
... produced by hydrothermally coating Verneuil corundum seeds or preforms . The seed section contains gas bubbles and may also have white flux residues producing feathers and wispy veils . The overgrowth has a crazed surface similar to ...
Contents
Introduction | 1 |
Groups species and varieties | 17 |
Bonding | 26 |
Copyright | |
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Absorption spectrum alexandrite almandine amber atoms beryl blue calcite carats Chapter Chelsea filter chromium cleavage colourless Composition containing corundum critical angle Crystal system Cubic cultured pearls detected diamond simulant diffraction Dispersion Double refraction electrons Figure fluoresce flux-melt Fracture garnet gem materials gemmological gemstone glass green Hardness heat hexagonal identified illumination imitations immersed inclusions instrument jadeite layers lens light source lines liquid Luminescence LW UV magnification method microscope minerals Monoclinic Myanmar Myanmar Burma natural stone opal opaque optic sign Orthorhombic oxide pavilion facets pink plane Pleochroism polariscope polarizing filters polished prism Prismatic produced quartz rays reflected refraction and optic Refractive index refractometer rutile sapphire shadow edge Specific gravity specimen spectroscope spinel Sri Lanka surface SW UV synthetic corundum synthetic diamonds synthetic emeralds synthetic spinel table facet temperature thermal conductance topaz tourmaline translucent transparent Trigonal USSR variety Verneuil visible wavelength X-rays yellow zircon