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Refractometers

gemgirl59

Rough_Rock
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Jun 3, 2015
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23
I am taking a gemology course online and now need to buy a refractometer to continue and be able to test gems I buy from sellers outside of the well known, respected sources(not that they are shysters, just small time sellers or ones oversees in Indian, for example). I am working(slowly as I can afford things)on starting a little home business to supplement my disability income making some jewelry and selling some gems. I have been looking at the Presidium II that measures RI from 1-3., conveniently spitting out your RI number on a screen and then another one (the name escapes me at the moment) that tells you on screen what the gem is! Yes, they are several hundred dollars, compared to less than $100. for a traditional refractometer, but seems great convenience as I buy parcels.. I do realize the digital doesn't work on cabachons, but I rarely deal with those. Money is very tight for me, so keep in mind that it's not like I have lots of extra for what may be frivolous purchases. I welcome any input, comments or good resources to buy what may be recommended.
 

gemgirl59

Rough_Rock
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Jun 3, 2015
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Thank you, I found quite a few links through that thread with good resources to buy gemology items and a page comparing refractorometers!
 

PrecisionGem

Brilliant_Rock
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Jul 27, 2004
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1,701
I good refractometer costs more than $100. I don't think you will find any labs using the Presidium. It's more a tool that is used in Jewelery stores by people who are not really gemoligist. It's accuracy has been called into question often. I think you are better off getting a quality refractometer, and expect to pay $400 to $1000 for one that is accurate. Look for one with a built in sodium light source.
 

gemgirl59

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Jun 3, 2015
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Thanks so much for your input. I am a home business trying to earn a little income to cover my health and practical needs as a disabled person. I am not a registered gemologist, but taking an inexpensive gemology program from International Gem Society to be able to assure customers that buy jewelry and gem stones from me, that what I sell is always geniune, mined OTG (out of the ground) natural gems. Integrity is paramount to me and I was glad to find this $400. IGS program that does cover everything, by is certainly not, nor does it imply, that it's program makes one a Graduate Registered Gemologist . The Gem-n-Eye III digital refractometer is concidered to be by far the best, most accurate digital Refractometer which contains a computer database of info to ID gems at your fingertips that can be updated from previous modals..... http://www.mineralab.com/Gem-n-Eye.htm,, a great SECONDARY tool. I will stick to a basic refractometer, as accuracy is my main goal and already have all the other tools to help with ID. ;-)
 

PrecisionGem

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Jul 27, 2004
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1,701
If you go to my website, under Information is a Download page. There is a spreadsheet program that will assist you in calculating the optical character and other information from readings taken with your refractometer. It runs in Numbers on the Mac or iPhone/iPad, and is a free download.
 

gemgirl59

Rough_Rock
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Jun 3, 2015
Messages
23
Wow, how cool....I will definitely download that, thanks for sharing that, giving me some much needed guidance and being a wealth of experience and information for me. I so appreciate this site and those so willing to advise! :razz:
 
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