Lapidary / Gemstone Community Forum
July 10, 2020, 10:49:55 pm
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 1 
 on: July 06, 2020, 01:24:04 am 
Started by trigon - Last post by navneetgems
HT-P (High temperature Pressure) sapphires were started for treatment in 2009. This treatment is not an easy treatment to do, according to our research, its a treatment that is very similar to the standard Heat treatment that is available readily in the market and since the difference is little (Especially with Microscope the traits were similar to those of traditional heat (Lotus Gemology, 2019). Interesting that this sapphire treatment that is capable of doing permanent deformation of the sapphire lattice, in particular crystallographic orientation, not maybe in the entire direction. So you know some people might say, we are using a kind of press which pushes sapphires from all directions. Ceramics in general, including sapphires are resistant to compression, but they are not resistant to tension. This is a property of all material with covalent or ionic bonding. But if you pull it, it would break apart quite easily or show deformation. In terms of sapphires its not so important even though you apply compression from all sides, you will still have tension components at particular crystallographic direction, because its an anisotropic material.

You can check out Heat treatment video at https://www.youtube.com/watch?v=i4rb6u0V4-s&t=25s

 2 
 on: July 05, 2020, 06:13:32 pm 
Started by Christiero - Last post by Christiero
Hi, from Washington State-
Im so thrilled to be accepted to such a knowledgeable group. Thank you!
Im doing some metal smithing and have always collected stones of all sorts, and curiously enough, found you on a Pinterest posting!
 

 3 
 on: July 01, 2020, 10:46:36 pm 
Started by Eu_citzen - Last post by navneetgems
Thank you for sharing informative links.

Here, I would like to add one more link for Gem cutting - Emerald faceting.

https://www.youtube.com/watch?v=0ZHQXx79-9I&t=2s

 4 
 on: May 25, 2020, 04:22:01 pm 
Started by Hansel - Last post by Hansel
I have a Star Diamond saw, model 10-PF.  They are no longer in business.  I need to make a gasket that goes between the top plated and the tank that holds the lubricating oil.  It is a rectangular shaped gasket.

What type of  material should I used to make the gasket?   

I have tried both cork and bicycle inner tube material, but both of these materials fail after some use.

Thank you


 5 
 on: May 20, 2020, 05:42:44 am 
Started by Macknight - Last post by kanejohn
hey i am new here

 6 
 on: April 26, 2016, 09:14:13 am 
Started by Enchantra - Last post by Enchantra
The new server is up.
The backup here is in progress and anything posted after 11AM Central time today to this forum will not be in the backup and will be lost once the forum has moved.
If you wish to start new topics/postings, go to the new site, grab a membership and post.

http://lapidaryforum.net/group/index.php

 7 
 on: April 26, 2016, 08:21:30 am 
Started by Jhon P - Last post by Jhon P
Fresh off the saw. I have had this rock for a while it was given to me.  I wa thinking that I should do somthing with it.

 8 
 on: April 25, 2016, 06:57:32 pm 
Started by Enchantra - Last post by ileney
Thank you for taking this on. I learn a lot from this site and would hate if it disappeared.

 9 
 on: April 25, 2016, 06:56:40 pm 
Started by Jhon P - Last post by Sandsave
Sounds like a plan, I'll PM you when we head down, it will be later this summer.

Sandsave

 10 
 on: April 25, 2016, 06:49:08 pm 
Started by mick B - Last post by ileney
Simply lovely! The glow it has is incredible.

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