This is not a paid promotion, I am a UK antique dealer and I bought this gem tester for business and personal use for myself and this is my honest review of the product, I am going to talk about what it is, why you need it and how it can not only save you a great deal of money but make you heaps of money at the same time.
What is the Presidium Gem Tester ?
The Presidium gem tester is an scientific instrument that uses thermal conductivity to identify gem stones. Basically it means there is a copper nib at the end of the pen and the instrument measures how fast the heat is drawn off to determine what the gem is that you are testing.
Why Would You Need A Gem Tester ?
To answer why you would need a gem tester it is provably better if I explain a little about myself. I am an antique dealer , I go around flea markets, yard sales, car boot sales and auction houses. I buy antiques , collectables and jewellery. Now what this means is I am not a specialist so I can tell you if a ring is gold or Sterling silver but I can not tell you what gems are set in to a piece of jewellery. I have always had to pay a jeweller to identify and value my rings as there was no way of me knowing what stones / gems had been used. I really don’t have the time to go and study Gemmology so that I can identify gem stones myself so this was the next best thing.
Your options really are this. (1) pay to have jewellery identified by a jeweller (2) buy a machine to identify gems yourself. (3) Or You just sell jewellery with out gem identification for example ( 9ct yellow gold Dress Ring ) but this will cost you money in the long term as you can never achieve a top price by selling like this and there is no point in guessing what gems are in the ring as you could find it winging its way back to you with a unhappy buyer.
Need To Know Gems.
The main reason we as dealers would need to know what gems are set in our jewellery is nothing more than placing an accurate description for sale and to establish a price. As I have already said up to now I have always had to pay a jewellery to identify my gem stones, Now depending on who you use and where you are in the world. Jewellers will do a mini valuation and identification for a small fee however sometimes its a small fee plus a percentage of the value. In real terms what this means is it might cost you up to £20 or £30 just to identify what gems are in a ring or necklace. But with the Presidium it will identify the gems for you at home if it works.
How to Value gems ?
Once the gem tester helps you to find out what gems are set in to your jewellery you can then look to working out a price for each item identified. For example if you have a ring set in 9ct gold with a large Amethyst and some small diamond chips you can look for comparable rings either up for sale or sold on one of the dozen selling platforms. Diamond chips are not highly sort after its not really until you get up half a carrot or bigger you need to worry about having something of great value.
Jewellery will always have a base value which is the melting value known as scrap or spot price. It is then up to you to find out how much more you can get above the melt value. The spot price changes every hour of every day depending on the stock market.
I am going to use today’s prices 21/08/2020 for you to have an example. 9 ct Gold is running at approx £18 per gram. (Take in to account a smelter will deduct stone weight) if you have an Amethyst ring set with diamond chips that weighs six grams you can safely allow five and a half grams for the gold content which is worth £90 so the question is then how much more can you extract for the item being a saleable piece of jewellery and how much will the gems add, and this is why I bought the Presidium Gem Tester. The only question is now does it work ?
The Presidium Gem Tester Review
How much does the gem tester cost ?
Well I have had my eye on these testers for a couple of years, I looked quite regular but couldn’t find any for sale in the uk however for the last year or so they have been available over seas, however by the time you paid tracked shipping costs and customs duty charges it made them too expensive to buy on a gamble of them being any good. However this year I have noticed they have become available in the UK I bought mine on ebay however they maybe available on amazon or other platforms.
There are not a lot of people selling them checking today there are only two on Ebay market place one priced at over £400 and the other at approx £250. so there is a big difference in prices. I don’t know why there is such a discrepancy in the prices but I would shop around as both these prices were for exact same product. I can tell you I paid £300 for mine when I bought it and when I looked a week later the same seller had upped his price to £500.
Since the cost of a mini valuation is on average £20 per item I need this gem tester to not only work but last a few years. It needs to test at least 25 pieces to break even or earn its cost back, which should take me a month however for some work from home resellers this might take a year or two to actually find items worthy of testing so this machine really does need to last.
A Look At The Presidium Gem Tester II
The gem tester comes well presented, in a nice professional designed box, inside there is also a pouch which opens and closes with a zip to keep your instrument safe. The gem tester can be operated with two AA batteries or run on a mains lead however please note that it comes with a two prong plug and you may need an adaptor. It comes with its power lead, instruction manual and two warranty cards. I would suggest if you are going to run on batteries please use a good brand and do not leave them in the instrument when it is not in use for fear or acid damage to such an expensive machine.
The tester is lighter than you would expect so very portable, it is also very easy to set up, the pen plugs in to the back along with the power lead. It comes factory celebrated to the gems so no complicated set up and no need to have gems at hand to set a machine up.
Once your set up and switched on it is as simple as wait for the red light to come on and press the pen firstly on the pad ( Cal ) making sure to press firm enough to depress the nib fully in to the pen. The pointer will point to the Cal on the display. You then repeat but pressing the pen on the Glass Pad and the pointer will read glass.
This was all the set up that was needed and to be honest was perfect for me, I need simple to use and not too complicated.
Now I am all set up and Calibrated its time to test some jewellery. I filmed the testing of the jewellery should you wish to view the film ( https://youtu.be/y37WJpW7HBE ) I tested what I had to hand which was an Amethyst and Diamond ring. I tested a Tourmaline 18ct gold ring. I tested a Diamond solitaire, I even tested glass and paste that was set in to sterling silver. All Gems should be dry and clean. they can be tested in a ring or on a testing plate.
For my experience I feel that the Presidium Gem Tester II worked and done what I wanted it to do so it is a worth while investment, easy to use and so far reliable, it is expensive but will work that off in a short time and looks quality enough to last a good few years.
I do feel that it could have been improved with the company supplying a gem chart showing the different colours available for different gems and also a chart showing where each gem would come on the display. The reason for this is that multiple stones can show same section so you need an idea of what the gem is before you test to confirm.
However I am happy with my purchase. This is not a paid promotion in any way, this is my honest review of a product I purchased to use myself. I hope you find it useful.