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

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

When it comes to the geographic origin of gems, curiously enough, historians sometimes put forward p

In 1955, the first report on Thai diamond was made by Dr. Payome Aranyakanon, a renowned tin explora