The Value of Gemstones
The Value of Gemstones

The quality and value of a gemstone is dependent on four main features: Cut, Colour, Clarity and Carat.

Cut

Gemstones can be cut into many different shapes. A quality cut will ensure that the light reflects throughout the stone to maximise the stone's brilliance and beauty. Stones that are well cut will have an even colour saturation throughout the stone.

Good quality stones do not have an obvious window - a pale, lighter area in the middle of the stone that allows you to see straight through the gemstone.

Colour

Tanzanite has what many would consider the most stunning blue hue out of all the gemstones. The most desired colour of a Tanzanite gem is a deep indigo with a hint of purple. When viewed from different angles beautiful Tanzanite gems will also reflect outstanding changes of colour from blue to deep purple with possible hints of reddish purple.

Usually Tanzanite is heated to approximately 500 degrees Celsius to enhance the colour of the gemstone. This is recognised as standard practice across the world.

As a natural product, Tanzanite gems do come in a range of blue-violet colours so it is important to be happy with the individual colour of the gem you choose.

There are many different grading systems to identify the colour of Tanzanite stones. We use the following system to grade our pieces of Tanzanite:

AAA is very strong violet-blue
AA is strong violet-blue
A is violet-blue
vB2 is light violet-blue

Clarity

As a natural product, gemstones may have small imperfections. The clarity of a gemstone refers to the visibility of any imperfections or blemishes in the gemstone. The clarity of a coloured gemstone is usually based on the visual appearance of the stone rather than on set clarity grades.

Top quality Tanzanite stones should be free from any imperfections to the naked eye and when examined with a loupe (a ten-power magnifying glass).

Carat

The standard measure of weight for gemstones is the carat, which is equal to one fifth of a gram. Since larger stones are less common and harder to come by, they are often more expensive per carat than smaller stones.

When purchasing a gemstone it is important not to immediately assume that a larger stone is more valuable than a smaller one. The cost of a gemstone is determined by its cut, colour and clarity as well as its size.