A brilliant explanation. Ohhh the lines of truth. One of many tests, I find the refractive index is one of the best guides. Daunting at first, but as you say, it takes practice. Thank you for sharing your knowledge.
It was such a joy to find this simple and very clearly explained video. I am a first year Gemmology student studying in Spanish so I often need to look for materials in English to help me fully understand the concepts. THANK YOU this is just what I needed!
Thank you Claire, so nice to have a teacher/lecture give us the run down on the gem equipment. I love how you can also work the birefringence from the RI readings 😁 and yep I still need more practice before my mid year exams🤣
Good coverage but showing a picture using the polarizing filter would have been useful. Also on a safety note avoid getting the fluid on your hands as it is dangerous. A question- once opened how long is the fluid good for and how do you know when it needs to be replaced. Again thanks.
Fair play to you. I've been a crystal fiend for over 20 years and I'm not bad at guessing....but that's all I can do, guess. I've always been daunted by the thought of a refractometer and thought about maybe getting one of those Presidium gem testers and I wonder what someone like yourself thinks about those machines. Cheers 👍
Awesome you bet it is great to see what you taught or shared been used the best like you say from the bottom yup hands on then the tools knowledge knowledge awesome video thank you
Do the specimens need to have a flat, polished surface? Could a peice of rough material be effectively sampled or would another type of device be better for facet rough material?
Hello, have a good day, is there a table for reading gemstones? For example, when examining any stone on this device and the number 1.55 or 1.6 came out, for example, is there a table that matches the numbers to know the type of stone. Thank
Yes! It sounds like you are looking for a Refractive Index Chart. Many sites have these online. Here is one we found: www.globalgemology.com/gem-refractive-index-chart.html#/
Say all this is done. How can you tell what stone it is for sure, meaning there are a lot of same color stones but not the same stone. Is there a chart to help ID the stone?
Yes! There are charts that list the refractive indices of many stones. And remember, the refractometer is measuring how a stone slows down the light, so even if, say a Topaz, has a similar color to a Sapphire, they will have different refractive index readings indicative of their identity.
I love how she explains things.
A brilliant explanation. Ohhh the lines of truth. One of many tests, I find the refractive index is one of the best guides. Daunting at first, but as you say, it takes practice. Thank you for sharing your knowledge.
It was such a joy to find this simple and very clearly explained video. I am a first year Gemmology student studying in Spanish so I often need to look for materials in English to help me fully understand the concepts. THANK YOU this is just what I needed!
Thank you Claire, so nice to have a teacher/lecture give us the run down on the gem equipment. I love how you can also work the birefringence from the RI readings 😁 and yep I still need more practice before my mid year exams🤣
It's so fascinating on how this machine works🤔😯🔬💡 and to teach us how gemstones💎 have the shadowing effect. Thanks for sharing.🤗💎
So nice of You Mam for such nice information in a very soft easy and beautiful way❤
Good coverage but showing a picture using the polarizing filter would have been useful. Also on a safety note avoid getting the fluid on your hands as it is dangerous. A question- once opened how long is the fluid good for and how do you know when it needs to be replaced. Again thanks.
Fair play to you. I've been a crystal fiend for over 20 years and I'm not bad at guessing....but that's all I can do, guess. I've always been daunted by the thought of a refractometer and thought about maybe getting one of those Presidium gem testers and I wonder what someone like yourself thinks about those machines. Cheers 👍
That morph cut at the beginning was jarring I thought I was losing it for a moment
Thank you! You explained it so well.
Thanks for the video.
Well done. 👍
So valuable information about the instrument, thanks
Thank you for telling us this!
Thanks for sharing your valuable information, excellent presentation
Awesome you bet it is great to see what you taught or shared been used the best like you say from the bottom yup hands on then the tools knowledge knowledge awesome video thank you
Great teaching! Thank You 😊
Thanks
Do the specimens need to have a flat, polished surface? Could a peice of rough material be effectively sampled or would another type of device be better for facet rough material?
If I put my gemstone on light. It’s show orange and red Line. That is double refraction or it’s normal
Excellent presentation. Will JTV be carrying this set-up? I hope.
Hi Wendy! We've put links in the description of the video for you to explore our refractometers! Let us know if you have any questions.
Do carbonado black diamond has refraction? a polished one if it has a refraction what is the common R.I. of it? Thank you...😊
Hello, have a good day, is there a table for reading gemstones? For example, when examining any stone on this device and the number 1.55 or 1.6 came out, for example, is there a table that matches the numbers to know the type of stone. Thank
Yes! It sounds like you are looking for a Refractive Index Chart. Many sites have these online. Here is one we found: www.globalgemology.com/gem-refractive-index-chart.html#/
@@gemsdo synthetic gems also have the same reflective index
Say all this is done. How can you tell what stone it is for sure, meaning there are a lot of same color stones but not the same stone. Is there a chart to help ID the stone?
Yes! There are charts that list the refractive indices of many stones. And remember, the refractometer is measuring how a stone slows down the light, so even if, say a Topaz, has a similar color to a Sapphire, they will have different refractive index readings indicative of their identity.
@@gems Awesome, thank you
how much are these Nd what is the preferred brand?
show the polazing pixtures
Name of chemical pl
How much will be if delivering to sri Lanka ?
Hmm , end for raw diamonds ?
❤️❤️❤️❤️
What about tools that DO NOT use oil?? What about the Presidium Gem Refractive index meter II !?!?!?
some laser-printed matarial chages lite direction...why?amd. and tenthousen yr old ago test tair gems ...kohonoor...thhey no aparetors
so...... what is the gem? all that work and no answer
demonstraight a diamond Vs lab grown diamond vs moisinate
I can you test a gem for me
What happened to Natalie :(
No One Want's Their Stone To Float!
&.....
DON'T MUCK UP YOUR REFRACTOMETER!