Australia s rich geology makes it the perfect place to develop a love of collecting minerals rocks and gemstones. Some important gemstones are not here yet.
Gem encyclopedia gia s gem encyclopedia is a virtual journey through the science and lore of gemstones from across the globe.
Gemstone identification guide. Gems are always measured in millimeter mm dimensions are given as. Turquoise a blue to bluish green gem material that has been used for over 6000 years. Gem varieties vary in density so carat weight is not a good indication of size.
Welcome to the gemstone section a free informational reference guide to gemstones jewelry and precious metals. You can use below search bar to find the specific gemstone by typing it s gemstone name example corundum. Amazonite apache tears apricot agate banded amethyst carnelian.
Apatite is a phosphate mineral found in a variety of intense colors including purple green blue white and red. Join our mailing list below to download a free gem id checklist tutorial. Length x width x depth except for round stones which are.
To made gemstone identification easy. Black bloodstone chalcedony blue beryl blue lace agate. See what s inside discover the 17 practical steps to gemstone identification even if you re just getting started with gemology learn how you can use specific tools to gather data make observations arrive at an accurate id.
Blue chalcedony blue tiger eye botswana agate brecciated jasper carnelian chrysocolla in quartz citrine quartz. Gem quality apatite can be found in the united states. Famed locations such as lightning ridge cobber pedy and broken hill have for over a century provided big yields for even the most amateur fossicker.
But developing your hobby for rock mineral and gemstone collecting doesn t exactly start out with huge discoveries of topaz. We are constantly working on expanding this list. Gia s guide to gemstones.
Ruby and sapphire ruby sapphire are gem corundums ruby when red sapphire when other colors. Refractive index is the most important testing factor so the values given for these are published in ascending order. Select gems by size not by weight.
The systematic study of gemstones has come a long way since the days when any attractive red stone was called a ruby today gemologists have to be able to identify over 200 different varieties of gemstones as well as detect an ever growing list of gem treatments and synthetics what once was an art has now become a science and gemstone identification without careful measurement is just guesswork. An important source of phosphorus apatite is used in matches. Aventurine a variety of quartz speckled with green mica.
Tumbled gemstone identification chart. Each precious stone page features additional detailed gemological information a buyer s guide photos videos research. Gemstones a z filter by alphabet.
You can also use the arrow mark to sort in various orders.
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