Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia

The detection of treatments in ruby and sapphire remains a critical aspect and has become an increas

One of the challenges facing gemologists today is the detec- tion of low temperature (below 1200°C)

Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie