Garnets – Not Only Red – What a Variety!
Garnet are durable, beautiful and come in a variety of colours. Garnets are well suited to both traditional settings and more modern settings. Due to the varieties of garnets available, there are garnets at all price levels. Meet a gemstone variety where visible inclusions add value to the stone.
Blue Garnets and Horse Tails
Variety of Colours
The varieties of garnet are coloured by the elements that are present as an essential element in the chemical composition of the gemstone, or the element is found in the gemstone as an impurity. The replacement of one element in the chemical composition of a mineral (either partly or completely) be another element having the same valency is called isomorphous replacement. The structure or form of the crystal is not radically altered, but wide variations in the physical properties (such as the colour) of the mineral may result.
When garnets are found they usually form in a habit called a rhombic dodecahedron, and are often found in clusters. This means that each crystal has 12 faces and each face is rhombus shaped (a squashed diamond shape). Most science museums have a variety of beautiful faceted and rough garnets.
Some garnets will be attracted to a magnet
Once I purchased a very inexpensive ruby ring online. When it arrived it was very obvious by the inclusions that it was an Almandine garnet, but before I used a microscope I did a very simple test with a magnet. Almandine and Rhodolite garnet and Spessartine, yellow Andradite (with iron) will be slightly attracted to a magnet. Ruby will never be attracted to a magnet!
Your Input (Join our poll or Scroll Down To The Bottom and leave a comment) – Emerald is winning the poll!
I plan to introduce different gemstones alphabetically. I will start with “A” (Ammolite) and see where it leads me. Leave a comment and let me know if you have a favourite gemstone that starts with the letter “H”. Take the poll! Can you name a reference to a gemstone in a song, movie or book?
Posted on August 11, 2011, in Individual Gemstones and tagged almandine, colour-change, demantoid, dodecahedron, Garnets, horse-tail, isomorphous replacement, spessartine. Bookmark the permalink. Leave a comment.