Gailey
Ideal_Rock
- Joined
- May 14, 2008
- Messages
- 3,783
Date: 2/21/2009 2:10:01 PM
Author: Chrono
Quote:
This was another entry for the 2009 American Gem Trade Association (AGTA) competition. A rich velvety orange citrine in a unique brilliant octagon cut. Very reasonably priced for a competition-level gemstone, and perfect for a huge cocktail ring or pendent!
22.37 ct, 17.9 x 17.9 x 13.1 mm, VVS clarity
$390
Yellow tourmaline without a secondary brown modifier is extremely difficult to come by. However, if you like the brown secondary, you should go for it. I was just describing what I didn't like about "golden" colored stones. Typically, unless the stone has a very high RI that gives it great sparkle factor (ie diamond or garnet), a secondary brown modifier can sometimes make a stone look murky or dull. That's one of the reasons I'm probably not a big fan of yellow gemstones. However, I do love Mochi's asscher chrysoberyl because it does have a strong green secondary, and that makes it more attractive in my eyes. Some people would prefer the stronger brown. It's a matter of taste, but I just brought it up because when you do go for a stone with a yellow primary color, you often get secondaries of either brown and/or green. You just need to figure out what you find more appealing.Date: 2/21/2009 8:21:18 PM
Author: arjunajane
Wow, what alot of great answers, thankyou all!
I will try to answer everyone:
TL, thanks for your response and the info - so which ones would you suggest then? What about a yellow tourmaline, can you tell me about those?
Heliodore is yellow beryl and has a very low RI, but it''s around a 7 on the Mohs so it''s durable enough for a ring, but not for everyday wear.Date: 2/21/2009 8:28:21 PM
Author: arjunajane
So, the options at the moment are to get a grossular garnet, but in a slightly smaller size than I was after..
or a bigger yellow zircon or heliodore. (in no particular order).
I haven''t asked the vendors yet about chrys.
Does anyone have thoughts on the zircon vs the heliodore? As in dispersion, wearability etc?
Thankyou TL for the info - that does help me better understand. I''m not sure yet if I prefer the brown or green - I guess no modifier at all, lol! I notice you said this is hard to come by - would you say that FF''s asscher has a modifier?Date: 2/21/2009 9:10:50 PM
Author: tourmaline_lover
Yellow tourmaline without a secondary brown modifier is extremely difficult to come by. However, if you like the brown secondary, you should go for it. I was just describing what I didn''t like about ''golden'' colored stones. Typically, unless the stone has a very high RI that gives it great sparkle factor (ie diamond or garnet), a secondary brown modifier can sometimes make a stone look murky or dull. That''s one of the reasons I''m probably not a big fan of yellow gemstones. However, I do love Mochi''s asscher chrysoberyl because it does have a strong green secondary, and that makes it more attractive in my eyes. Some people would prefer the stronger brown. It''s a matter of taste, but I just brought it up because when you do go for a stone with a yellow primary color, you often get secondaries of either brown and/or green. You just need to figure out what you find more appealing.Date: 2/21/2009 8:21:18 PM
Author: arjunajane
Wow, what alot of great answers, thankyou all!
I will try to answer everyone:
TL, thanks for your response and the info - so which ones would you suggest then? What about a yellow tourmaline, can you tell me about those?
Great info, thanks TL!Date: 2/21/2009 9:19:57 PM
Author: tourmaline_lover
Heliodore is yellow beryl and has a very low RI, but it''s around a 7 on the Mohs so it''s durable enough for a ring, but not for everyday wear.Date: 2/21/2009 8:28:21 PM
Author: arjunajane
So, the options at the moment are to get a grossular garnet, but in a slightly smaller size than I was after..
or a bigger yellow zircon or heliodore. (in no particular order).
I haven''t asked the vendors yet about chrys.
Does anyone have thoughts on the zircon vs the heliodore? As in dispersion, wearability etc?
Zircon is a bit softer, but has much higher disperson than a Heliodore and it''s also doubly refractive. I think most, if not all yellow zircon is heated. Gene at precision gem has several for sale on his website right now.
Chrysoberyl is the best for everyday wear and has more dispersion than heliodore, but less than zircon.
I think so, given that they have the same R.I., dispersion and lustre.Date: 2/21/2009 9:22:50 PM
Author: arjunajane
Great info, thanks TL!
So does yellow beryl have similar optical properties to aquamarine? Or are they very different, if you know what I mean? As in, Coati's aqua asscher looks quite sparkly and bright to me - could I expect something similiar from yellow beryl?
I think some gem afficianados would say there is no such thing as a colored gem without some sort of secondary modifier. However, I will say that finding a gemstone that is a as close to pure yellow as possible is probably a very rare thing. The stones I think that come closest are probably fancy vivid carary yellow diamonds.Date: 2/21/2009 9:20:01 PM
Author: arjunajane
Thankyou TL for the info - that does help me better understand. I''m not sure yet if I prefer the brown or green - I guess no modifier at all, lol! I notice you said this is hard to come by - would you say that FF''s asscher has a modifier?Date: 2/21/2009 9:10:50 PM
Author: tourmaline_lover
Yellow tourmaline without a secondary brown modifier is extremely difficult to come by. However, if you like the brown secondary, you should go for it. I was just describing what I didn''t like about ''golden'' colored stones. Typically, unless the stone has a very high RI that gives it great sparkle factor (ie diamond or garnet), a secondary brown modifier can sometimes make a stone look murky or dull. That''s one of the reasons I''m probably not a big fan of yellow gemstones. However, I do love Mochi''s asscher chrysoberyl because it does have a strong green secondary, and that makes it more attractive in my eyes. Some people would prefer the stronger brown. It''s a matter of taste, but I just brought it up because when you do go for a stone with a yellow primary color, you often get secondaries of either brown and/or green. You just need to figure out what you find more appealing.Date: 2/21/2009 8:21:18 PM
Author: arjunajane
Wow, what alot of great answers, thankyou all!
I will try to answer everyone:
TL, thanks for your response and the info - so which ones would you suggest then? What about a yellow tourmaline, can you tell me about those?
I am going to see how that yellow tourm on Dan''s site turns out
Harriett, would you happen to have any photos of your happy heli around?
Thanks Harriett - yes I realize that - I was just wondering as TL said they have a very low RI, however some aquas don''t seem like that to me - maybe I''m mixing up RI with dispersion? (very possible)Date: 2/21/2009 9:26:43 PM
Author: Harriet
I think so, given that they are both members of the beryl family.Date: 2/21/2009 9:22:50 PM
Author: arjunajane
Great info, thanks TL!
So does yellow beryl have similar optical properties to aquamarine? Or are they very different, if you know what I mean? As in, Coati''s aqua asscher looks quite sparkly and bright to me - could I expect something similiar from yellow beryl?
Beryls (aquamarines, heliodores, morganites, goshenite, emerald, bixbite, and I'm probably missing a group here) do not sparkle in the sense like a diamond or a garnet with a high RI. They don't throw off rainbows. If well cut and clean, they will sparkle due to that, but beryls are typically sought after for their colors than the "sparkle factor." I know some people would disagree with me on that, but I own a heliodore, morganite, aquas and emeralds, and they are not the sparkliest of stones. A really well cut one will sparkle nicely, but the fire and dispersion will be lacking. Coati's aqua assher is beautiful because it has a good saturation of color (which is rare in aqua) and it's cut well, and it has an excellent polish to it.Date: 2/21/2009 9:22:50 PM
Author: arjunajane
Great info, thanks TL!
So does yellow beryl have similar optical properties to aquamarine? Or are they very different, if you know what I mean? As in, Coati's aqua asscher looks quite sparkly and bright to me - could I expect something similiar from yellow beryl?