How to ascertain the identity of common coloured gemstones

Here in this video, we demonstrated how to ascertain the identity of common coloured gemstones in 2 simple steps! First by using the Presidium Gem Indicator (PGI) to first test on the gemstone, and then using the Refractive Index Meter II (PRIM II) to further narrow down the gemstone's identity.

[@DragonflyBeez]

Hi Armani! Very nice video! 🙌🏼👏🏼👏🏼👏🏼

[@faithkm4875]

I am talking about the presidium refractive index meter ii

[@faithkm4875]

The presidium refractive index meter gives wrong reading for both purchases. I bought two thinking that one of them would work fine. For Moissanite it give the reading of 2.00 and for corundum 1.65 or less. How can I fix this instrument?

[@roundsaturn31]

Hello, so if I understand correctly, this tester will quickly seperate gemstone from glass/synthetic but not tell you exactly what stone it is because of overlapping thermal properties of many stones. So you need to in most cases do more tests to narrow it down. It also will not tell you if a stone is lab made or natural, Correct? I still believe it is useful for seperating stones when buying lots of product at a time..

[@carriesgiftsgalore7936]

I am glad you have this channel. I am thinking of buying one of these. Thank you.

[@gabrielomena2674]

do you still want it?

[@carriesgiftsgalore7936]

@@gabrielomena2674 sure I want one but they are too expensive for me yet.

[@mazinalhoseny]

Thanks for the explanation, where are these devices sold?

[@presidiuminstruments]

Hi Mazin, thank you for contacting Presidium. You can purchase these devices through Presidium Estore: presidium.com.sg/store/

[@bio7159]

@@presidiuminstruments hello dear , I need your recommendation about tester for diamond and for gems as well !! Can you advise wish is the best for it !

[@presidiuminstruments]

@@bio7159 Hi, Thank you for contacting Presidium. Could i trouble you to fill in the contact form (presidium.com.sg/contact/) to get more info from you, so that we can recommend the correct products.

[@thedesertdancer]

It appears that the Presidium Gem Indicator pen is not enough to determine or identify the colored gemstone. Is there an easy to use single device to test a colored gemstone rather than purchase more than one equipment and still have a lot of room for error and guess-work?

[@presidiuminstruments]

Hi Donna, thank you for contacting Presidium.
PGI is testing based on thermal conductivity of gemstones and assists users in estimating the identity of up to 31 gemstones. As there are overlapping thermal properties of certain stones, we recommend users to use other methods of gemological identification such as refractivity, microscope to ascertain the identity of the stone. In the event of doubt, we recommend taking the stone to a reputable gemological laboratory for further analysis.

[@caz4523]

Can you use the presidium refractive index meter with a stone that is in a setting?

[@presidiuminstruments]

Hi CAZ, thank you for contacting Presidium. User will need to place the table of the stone directly on top of the sensor and thus, this can only be used on loose gemstone. For mounted gemstones, the prongs or setting will not allow this and thus, it cannot be used on them.

[@caz4523]

@@presidiuminstruments TY for the response

[@christinerose5235]

Can it detect coloured Diamonds?

[@phobegalatea]

Hi, where to get these instruments in the Philippines? Thank you.

[@presidiuminstruments]

Hi Sherv, thank you for contacting Presidium. We do not have any resellers in the Philippines. For purchase of these instruments, please visit www.presidium.com.sg/store to purchase.

[@dannyboy621]

I need to know which gemstones it will test, what are the 31 types?

[@presidiuminstruments]

Hi Danny Boy, thank you for contacting Presidium. Kindly email us at [e-mail]

[@manatworkhoyeahlovegodmade6373]

Dose it tells Diamond is a moissanite Diamond

[@presidiuminstruments]

Hi, thank you for contacting Presidium. Gem Indicator is unable to separate diamond and moissanite

[@josephnorthington2969]

You can tell a Diamond from Moissanite by the doubling Moissanite will show

[@antonioborojo5227]

La comunidad de habla ispana es muy grande.. porque no viene el tester en español.?. y porque no me regalan uno a mi?...

[@marcobozzo7192]

To complicate

[@faithkm4875]

Gives wrong reading every time. I have two - both are reading inaccurately. It worked fine the first few months, then it is giving wrong readings for both. They do not tell us how to calibrate this instrument. Waste of money.

[@presidiuminstruments]

thank you for contacting Presidium Instruments. Kindly email us at [e-mail] and state your serial number in the email.