Tanzanite is one of those special events in history that only occurs rarely. Discovered in the 1960s the current mines will exhaust in 10-20 years time (with most estimates closer to 10 rather than 20)
Tanzanite is about 1000 times rarer than diamonds and the prices have risen steeply recently leading many to consider Tanzanite as a form of investment
The four Cs as for Diamonds applies for Tanzanite also; Colour, Clarity, Cut, Carats apply but the colour is the key for the Tanzanite investment stone
Tanzanite is commonly graded based on colour from 'A' to 'AAA' and the price difference is dramatic between two identical stones; one of AAA Colour and one of AA or A Colour. AAA being a very dark very rich blue with the characteristic reddish-pink and purple fire inside the stone being very obvious, through to the A Colour stone where the blue is watery and the pink and purple fire can be seen, but you have to look to see it; while in an A- or B stone you might not see the reddish fire at all. There is a more rigorous method of grading Tanzanites created by the GIA which is based on the concept of cross referencing Tone and Saturation which ensures that the system is so complicated that you almost never see it is use on eBay, although it is a very sound method of grading
I’ve attached some pictures as examples to try demonstrate the differences
AAA D-Block (This sample is 10 years old before the D Block mine closed) - AAA D-Block is sometimes referred to as AAAA Grade and in legend has more red 'fire' then the regular AAA grade
When considering Tanzanite for investment you should be looking for VS clarity or better, but there are many more high quality Tanzanites proportionately of this grade than there are for diamonds
You may also note that there are three distinct colour bands for Tanzanite; The Traditional Blue (which will often have some lilac tone to it, but the less lilac the better in terms of value), Lilac (which which will often have some blue tone to it) and Green (which is considered not that desirable in terms of Tanzaite colour). If you're looking to invest in Tanzanite the general rule is: The stronger the Blue the better, the more Red fire the better, the less Green and the less Lilac the better, the Clearer the better is the general rule
You might also see is use in advertising the terms 'D-Block' and also 'AAAA' Grade Tanzanite. In Tanzania the mines for Tanzanite are split into four regions A,B C and D Blocks and in the past the D Block produced the most high quality stones and so became to be understood with high quality, but it should be noted that an AAA grade stone from any of the four Block are identical and it shuld also be noted that the D-Block mine closed some time ago with most stones coming from C-Block these days
The Term 'AAAA' Tanzanite refers to AAA quality Tanzanite that was sourced from the D-Block, but it should be noted that AAA Quality Tanzanite is the same irrespective of whether it is sourced from A, B, C or D Blocks and so the whole D-Block term and also the AAAA term should be treated very carefully when buying, especially if a premium is being asked over, say, C-Block AAA Grade
We have occasionally have Tanzanite items at NRS-Diamonds from VVS to SI Calrity & are constantly updating our stocks (http://stores.ebay.com.au/NRS-GEMS-and-DIAMONDS)
And just in case you’re not happy with your purchase we offer refunds as detailed in our eBay advertising & we’re always happy to provide advise.
We want happy customers who think so much of us that they come back time & time again!
If you found this guide helpful please let us know by clicking on 'yes' below