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Messages - scratchie

Pages: 1 [2] 3 4 ... 12
16
Gemstone Discussions / Re: Topaz?
« on: December 01, 2017, 03:41:23 PM »
re SG test ,
I think you've missed a step - you have to find the difference in the weight in air and the weight in water and then do your division
Jon

17
Gemstone Faceting / Re: Checker Oval
« on: September 16, 2017, 12:03:25 PM »
Re the JB CROSS pattern for novices .
That's ridiculous expecting novices to all have a 64 index wheel , particularly as some of the indexes don't transpose to a whole number on a 96 index.
John

18
Saws and Diamond Blades / Re: Pintrest ... concave amatrine
« on: July 31, 2017, 02:02:01 PM »
Makky ,
You are brilliant - not only great work in cutting it but a top photo as well.
John

19
Saws and Diamond Blades / Re: Pintrest ... concave amatrine
« on: July 21, 2017, 04:36:55 PM »
A great example of the benefit that can be obtained by concave faceting. How many facetors on this forum have concave faceting attachments on their facetor ?
John

20
Gemstone Faceting / Re: Concavr Faceting Comp
« on: June 29, 2017, 08:08:03 PM »
I have concerns that the discussion assumes that concave faceted stones follow the set design of gemstones in competitions - e.g. Standard Round Brilliant ,  rectangular wit cut corners etc.
This is ignoring the fact that concaving opens up a completely new field of gemstone design.
Have a look at concave cut gems on the internet. I suggest the American Gem Traders Association awards which are held twice a year. Look at the results of cutters like John Dyer, Dalan Hargrave and see what is possible .
Don't shackle concaving by lumping it in with the current format of competition.
 Group 3, Section 3 in the AFLAC rules already allows for freeform stones. A similar description could be written for faceted concave stones with points awarded for Aesthetic appeal , Harmony of shape , design etc. along with points for the skills of faceting.
Concave facets have the potential to open up a new degree of designs by allowing facetors to design and build unique patterns we haven't seen yet.
This subject will be an item for discussion at the Annual Muster of the Australian Facetors Guild at Casino in September. It could be an interesting discussion.


John

21
Ask a "Silly" Question / Re: What di you feed your machine with today
« on: June 15, 2017, 03:01:08 PM »
It's good to see some positive thought into the performance of gemstones. In my experience many cutters follow the same old patterns with no thought as to how the finished stone could be improved. Tools such as Gemcad and Gemray are available and with a little thought can be used to cut more attractive stones. It's not just the light return that is important - it's the play of light as the stone is moved that counts !!
John





22
Trip Talk / Re: Heading to the Harts Ranges
« on: June 05, 2017, 04:29:54 PM »
Trevor ,
Hope you can find the sphene . I bought one from the Gemtree shop on avisit about 15 years ago
A beautiful stone . On my last visit to Gemtree about 5 years ago was told that no-one that they knew ( including the previous owner of Gemtree park ( Graham ?)  had found sphene in recent years
but certainly worth looking for. BTW I have another sphene that I bought in Sydney a few years ago and was told it had been found in the Broken Hill area. Is that possible ?
Good hunting
John

23
Ask a "Silly" Question / Re: Does dopping wax have a shelf life?
« on: April 23, 2017, 05:03:02 PM »
Ken ,
The answer is yes. It can deetriorate with age . You can test if  it is usable.
Hold the stick , one end in left and ,  the other end in right hand. Gently heat the middle of the stick over your spirit lamp . The word is gently . If the wax softens draw your hands apart.
If the wax is OK you will get a fine strand of wax where you have been heating it - a fine strand about as thick as a human hair. If it it doesn't form a thin strand then it's too old.
John

24
Gemstone Faceting / Re: L/W ratio on faceting diagrams
« on: March 07, 2017, 02:43:17 PM »
Gemcad will calculate the weight of the finished stone so you know if you are getting the maximum carat return.
I suggest you take the offer from several members to enter your diagram into Gemcad with the L/W ratio you think you can cut from the rough and you will get a calculation of the finished weight of the stone if cut in sapphire.
John

25
Gemstone Discussions / Re: Ruby inclusion id help
« on: February 15, 2017, 01:43:57 PM »
How were these images obtained and what do they mean ?
John

26
Gemstone Faceting / Re: GemRay observation
« on: November 11, 2016, 04:00:35 PM »
I'm pleased to see facetors are realising the value of a program such as Gemray for Windows .I gather you leave the gem colour amethyst , and the leakage a mid yellow . What do you have as the background colour ?
John

27
General Discussion / Re: gem cad' soft ware.
« on: May 12, 2016, 10:01:53 AM »
Swirly ,
It's a wonderful world we live in. Programs like Gemcad can improve your understanding of gem design and performance or we can choose to do things the same way our grandfathers did.
We all have a choice and I'm glad we do. Happy faceting - it's a great hobby
John

28
Gemstone Faceting / Re: VJ faceting machine
« on: April 12, 2016, 10:18:27 PM »
Lefty ,
We agree that the manual angle setting on the VJ is great, and I regularly check the digital readout against the manual and they always agree. So it's a belt and braces approach.
Whether having a setting to two decimal places is necessary has always been a hot debate and I think that it is not necessary for most faceting. A tenth of a degree is probably quite adequate for most faceting and the two decimal place phenomenon exists because the Gemcad program automatically calculates to that degree. But if you have the ability to set a machine to the two decimal places of each angle you won't do any harm to the resultant stone !!
Keep on enjoying your VJ - I hope you'll be as happy as I have been.
John 

29
Gemstone Faceting / Re: VJ faceting machine
« on: April 12, 2016, 12:07:47 PM »
I agree about the weight of the VJ machine. I can't take my machine to the Club because I have difficulty moving it by myself - in addition I have to get it up a flight of stairs to get it to the garage and into the car so it stays put.
Re the digital readout . I have had the machine for about 8 years and have had no problems with the digital readout. Also the other VJ owners in our Club report no problems . We used to have voltage variations where we live - until a new transformer was installed in our street our voltage would drop below 200v. at peak periods and it didn't ever affect the digital readout. Happily the new transformer keeps our voltage to acceptable levels.
If your machine has the digital readout I would suggest discussing it with Mal Johnson.
My verdict - the digital readout is absolutely tops.
John

30
Gemstone Faceting / Re: VJ faceting machine
« on: April 10, 2016, 04:58:54 PM »
The manufacturer of the VJ machines is at Childers , phone 0741262155, so I'd take it to him for any service.
If the VJ is in good condition I'd sell the Gemmasta and keep the VJ.
Just my opinion.
John


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