It may come as a surprise to find a biaxial figure in a uniaxial gem.
Much spectroscope work can be achieved with a simple penlight torch, this allows its use wherever you are.
A complete explanation of the construction and innovative use of the refractometer.
Each chapter has a list of the topics covered, for easy access.
Logically laid out with colour-coded guides.
The technique for which Alan is famous. Simple, versatile and without cost.
The use of all the Hanneman-Hodgkinson filters is explained.
Five different fluorescent responses from one gemstone.
Pages of absorption spectra designed to clearly show what you will see in the spectroscope
These four gem identities have required a more in-depth presentation.
A magnified look at various gems with helpful notes of interest.
Physical and Optical properties, in alphabetical order
Copyright Alan Hodgkinson 2015