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 Post subject: Colour Change Garnets
PostPosted: Wed Oct 06, 2010 1:02 am 
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Hi I am very new and I only joined today.
I am wondering if anyone can point me in the right direction to find research information, historic or current about colour change garnets, spinels and sapphires.
I have an assignment I am doing and I am having difficulty finding information of any kind on colour change gemstone. I can however find information on Alexandrite but that is not what I am looking for.
I hope someone can help?
Maree


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 Post subject: Re: Colour Change Garnets
PostPosted: Wed Oct 06, 2010 6:25 am 
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Location: the Netherlands
Hi Maree,

try AJU. The major gems all have their pages decked out with links to G&G articles from the period 1930 something to 1980. Scroll to the bottom of every color changing gem and see what the GIA published over the years. A quick glance reveals a mention of an alexandrite like sapphire on the sapphire page and a blue to red cc garnet on the garnet page.

Furthermore you can start digging through the really historic sources in the Gemology Source help, your personal library of historical books on the subject of gemology.


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 Post subject: Re: Colour Change Garnets
PostPosted: Wed Oct 06, 2010 10:21 am 
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Posts: 18966
Location: San Francisco
Gems and Gemology have featured several articles on Color Change Phenomenon over the years:
Here is a list of article published after 1982.
If any of the articles sound interesting, they can be downloaded (for a $12 fee) here:
http://gia.metapress.com/content/121035

Also, you can call the librarian at the GIA and get help with locating information:
800-421-7250 ext. 4046

In copying this list for you, I notice the article by Gubelin in the Winter82 issue repeated again and again. This might me an excellent place to start.

Let us know if there is anything else we can assist you with.

Color change
in alexandrite—discussion of
(Gübelin)W82:197-206,
(LN)Sp83:43, Sp86:46; from
Madagascar (GNI)Sp01:66; from
Nova Era, Minas Gerais, Brazil
(GN)Su87:123, W87:238-240,
F92:192, (LN)F87:164,
(Proctor)Sp88:16-32; from the
Tunduru region, Tanzania
(GN)Sp96:58-59
in bastnäsite from Pakistan
GNI)Su07:165-166
cause of (Gübelin)W82:197-206,
(Fritsch)Su88:81-102
clinochlore from Russia
(GN)Su95:129-130
corundum—(Gübelin)W82:197-
206; with asterism (GN)W87:241
diaspore (LN)Sp87:44-45
fluorite (Gübelin)W82:197-206,
(GNI)Su06:173-174, F08:263;
from Ethiopia (GNI)Su07:168-
169
garnet—(Stockton)Su82:100-101,
W85:205-218, (Gübelin)W82:
197-206, (Let)Su85:116,
(GN)Su98:138, F98:222-223;
grossular (Manson)W82:204-213;
grossular-andradite, from Mali
(LN)Su03:145-146; from
Madagascar (GNI)Su03:156,
(Schmetzer)W99:196-201;
pyrope-spessartine
(Manson)W84:200-207, (GN)Sp96:
53, W96:285-286; from Tanzania
(Dirlam)Su92:80-102
garnet inclusion in diamond
(LN)F82:169
in glass imitation of alexandrite
(GNI)Sp04:73-74
in hackmanite, produced by UV
radiation (GN)Su89:112,
W89:245-246, Su92:134
influenced by type of illumination
(Fritsch)F87:126-139
kyanite (Gübelin)W82:197-206
monazite (Gübelin)W82:197-206
in Purple Zandrite glass
(GNI)W05:364-365
remondite-(Ce) from Canada
(GN)W92:270-271
reverse, in zircon from Myanmar
(Bosshart)F06:94
sapphire—(P. Keller)Sp85:20-25;
with lead-glass filling
(GNI)Sp08:88; from Queensland,
Australia (GN)W93:292; from Sri
Lanka (GN)Su88:121; star
(GN)W87:241; from Tanzania
(Dirlam)Su92:80-102,
(GN)Sp95:64-65
in sapphire/synthetic color-change
sapphire doublets (LN)Su03:149-
150
in synthetic alexandrite from
Russia (Schmetzer)F96:186-202
in synthetic apatite (LN)Sp01:57
in synthetic diamond
(LN)W98:286-287
in synthetic sapphire
(LN)Su95:127
spinel—(Gübelin)W82:197-206,
(LN)Sp83:48, W84:232-233;
cobalt-colored (Shigley)
Sp84:34-41, (LN)F90:226-227,
(GN)W90:305-306; and synthetic
spinel (LN)W85:236-237,
Su91:112-113
tourmaline—(GN)F91:184-185;
from Mozambique (LN)F04:250-
251, Su05:173-175
in Zandrite glass (GNI)Sp04:73-74
[erratum W05:369]
zircon (GN)F95:212-213

I also located an article bu George Rossman here
Part 1
http://gia.metapress.com/content/r438n21tn04h2522/
Part 2
http://gia.metapress.com/content/7n0qp267605361v8/


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 Post subject: Re: Colour Change Garnets
PostPosted: Fri Oct 15, 2010 9:40 pm 
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Joined: Tue Oct 05, 2010 8:22 pm
Posts: 3
Tim wrote:
Hi Maree,

try AJU. The major gems all have their pages decked out with links to G&G articles from the period 1930 something to 1980. Scroll to the bottom of every color changing gem and see what the GIA published over the years. A quick glance reveals a mention of an alexandrite like sapphire on the sapphire page and a blue to red cc garnet on the garnet page.

Furthermore you can start digging through the really historic sources in the Gemology Source help, your personal library of historical books on the subject of gemology.




Thanks Tim much appreciated I will check it out Maree :D


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 Post subject: Re: Colour Change Garnets
PostPosted: Fri Oct 15, 2010 9:43 pm 
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Joined: Tue Oct 05, 2010 8:22 pm
Posts: 3
Barbra Voltaire wrote:
Gems and Gemology have featured several articles on Color Change Phenomenon over the years:
Here is a list of article published after 1982.
If any of the articles sound interesting, they can be downloaded (for a $12 fee) here:
http://gia.metapress.com/content/121035

Also, you can call the librarian at the GIA and get help with locating information:
800-421-7250 ext. 4046

In copying this list for you, I notice the article by Gubelin in the Winter82 issue repeated again and again. This might me an excellent place to start.

Let us know if there is anything else we can assist you with.

Color change
in alexandrite—discussion of
(Gübelin)W82:197-206,
(LN)Sp83:43, Sp86:46; from
Madagascar (GNI)Sp01:66; from
Nova Era, Minas Gerais, Brazil
(GN)Su87:123, W87:238-240,
F92:192, (LN)F87:164,
(Proctor)Sp88:16-32; from the
Tunduru region, Tanzania
(GN)Sp96:58-59
in bastnäsite from Pakistan
GNI)Su07:165-166
cause of (Gübelin)W82:197-206,
(Fritsch)Su88:81-102
clinochlore from Russia
(GN)Su95:129-130
corundum—(Gübelin)W82:197-
206; with asterism (GN)W87:241
diaspore (LN)Sp87:44-45
fluorite (Gübelin)W82:197-206,
(GNI)Su06:173-174, F08:263;
from Ethiopia (GNI)Su07:168-
169
garnet—(Stockton)Su82:100-101,
W85:205-218, (Gübelin)W82:
197-206, (Let)Su85:116,
(GN)Su98:138, F98:222-223;
grossular (Manson)W82:204-213;
grossular-andradite, from Mali
(LN)Su03:145-146; from
Madagascar (GNI)Su03:156,
(Schmetzer)W99:196-201;
pyrope-spessartine
(Manson)W84:200-207, (GN)Sp96:
53, W96:285-286; from Tanzania
(Dirlam)Su92:80-102
garnet inclusion in diamond
(LN)F82:169
in glass imitation of alexandrite
(GNI)Sp04:73-74
in hackmanite, produced by UV
radiation (GN)Su89:112,
W89:245-246, Su92:134
influenced by type of illumination
(Fritsch)F87:126-139
kyanite (Gübelin)W82:197-206
monazite (Gübelin)W82:197-206
in Purple Zandrite glass
(GNI)W05:364-365
remondite-(Ce) from Canada
(GN)W92:270-271
reverse, in zircon from Myanmar
(Bosshart)F06:94
sapphire—(P. Keller)Sp85:20-25;
with lead-glass filling
(GNI)Sp08:88; from Queensland,
Australia (GN)W93:292; from Sri
Lanka (GN)Su88:121; star
(GN)W87:241; from Tanzania
(Dirlam)Su92:80-102,
(GN)Sp95:64-65
in sapphire/synthetic color-change
sapphire doublets (LN)Su03:149-
150
in synthetic alexandrite from
Russia (Schmetzer)F96:186-202
in synthetic apatite (LN)Sp01:57
in synthetic diamond
(LN)W98:286-287
in synthetic sapphire
(LN)Su95:127
spinel—(Gübelin)W82:197-206,
(LN)Sp83:48, W84:232-233;
cobalt-colored (Shigley)
Sp84:34-41, (LN)F90:226-227,
(GN)W90:305-306; and synthetic
spinel (LN)W85:236-237,
Su91:112-113
tourmaline—(GN)F91:184-185;
from Mozambique (LN)F04:250-
251, Su05:173-175
in Zandrite glass (GNI)Sp04:73-74
[erratum W05:369]
zircon (GN)F95:212-213

I also located an article bu George Rossman here
Part 1
http://gia.metapress.com/content/r438n21tn04h2522/
Part 2
http://gia.metapress.com/content/7n0qp267605361v8/




Thanks very much Barbara, boy there is a lot of info much appreciated Maree :D


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