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ť Which colored stones are prone to fading in sunlight?

Which colored stones are prone to fading in sunlight?

P: 5/29/2007 11:20:47 AM
*DeeJay** Ideal Rock Total Posts: 6,491 Last Post: 9/23/2009 Member Since: 3/26/2006	At the gemshow last weekend Catmom told me to warn one of my friends who just bought an amethyst about the potential of fading, and I started thinking about other stones that might fade in the sun. Any insight here will be much appreciated!
Posted: 5/29/2007 11:20:47 AM

There are 9 replies to this message. There are 9 replies on this page.

P: 5/29/2007 11:29:35 AM
Chrono Ideal Rock Total Posts: 11,281 Last Post: 11/20/2009 Member Since: 4/22/2004	I've never heard of amethyst fading under sunlight over time but I do know that kunzite does fade from pink to clear white when exposed to sunlight repeatedly thus earning the nickname of the twilight gem (or something like that).
Posted: 5/29/2007 11:29:35 AM

P: 5/29/2007 3:40:38 PM
innerkitten Ideal Rock Total Posts: 2,920 Last Post: 11/21/2009 Member Since: 8/2/2003	Amethyst is supposed to prone to fading in sunlight. Such a bummer. And heated Zircon can revert to the color it was before it was heated. Not sure if it has anything to do with sunlight though.
Posted: 5/29/2007 3:40:38 PM

P: 5/29/2007 9:15:17 PM
FireGoddess Ideal Rock Total Posts: 12,145 Last Post: 3/23/2009 Member Since: 1/25/2005	Kunzite for sure.
Posted: 5/29/2007 9:15:17 PM

P: 5/29/2007 9:23:33 PM
Harriet Ideal Rock Total Posts: 11,800 Last Post: 11/19/2009 Member Since: 7/7/2006	Here's what Schumann says: "There are some amethysts that lose some color in dalylight. The original colour can be restored by X-ray radation." "The greatest experts are only as good as the sum total of what they have seen." (Souren Melikian)
Posted: 5/29/2007 9:23:33 PM

P: 5/31/2007 10:06:47 PM
lizzyd Cut Rock Total Posts: 260 Last Post: 6/11/2007 Member Since: 2/24/2005	I know that the colors of Green Spodumene (Hiddenite) and Pink Spodumene (Kunzite) can be somewhat unstable, and can fade if exposed to intense light and/or heat over time. I believe the same holds true for some nuked (irradiated) stones. Here's a good pic of a 28ct. hiddenite and an explanation of the effect. Scroll about 3/4 of the way down the page: http://atggems.com/Photos_Misc2.htm ETA: I inherited some big stones from my grandfather and recently sent them off to John Bradshaw of Coast to Coast Cutters (he's in Nashua, NH) for analysis and re-cutting. Turns out, two of the three pink stones are kunzite and can cleave so easily that they may not survive the re-cutting process. C'est la vie. They are of no use to me in the condition they are in now, so I might as well give it a shot. Anyway, my Mom always called it the Evening Stone. Come to think of it, I can post the "Before" pictures. There are five. Hopefully there will be five "after"pics too, but there may only be three. Best, LizzyD The Red Sox, the Patriots, and diamonds; what more could a girl from Baahstin ask for?
Posted: 5/31/2007 10:06:47 PM

P: 5/31/2007 11:48:21 PM
jewels5 Rough Rock Total Posts: 8 Last Post: 6/6/2007 Member Since: 9/24/2006	Hello! I am new to the forum... Amethyst can fade in the sunlight as can kunzite, rose quartz, irradiated yellow and orange sapphires, some brown topaz, and zircon can return to a light brown if exposed to lots of light.
Posted: 5/31/2007 11:48:21 PM

P: 6/1/2007 2:22:25 PM
twodoor2 Cut Rock Total Posts: 406 Last Post: 8/5/2007 Member Since: 4/2/2007	I had an aquamarine fade on me. Generally, the irriadiated stuff and some of the heat treated material for kunzite, morganite, and aquamarine, can fade. I also have a deep pink/purple untreated Kunzite, and it never faded. However, as a rule of thumb, I normally shy away from those particular pastel stones since you can never be 100% positive. My amethysts (and I have several) never faded.
Posted: 6/1/2007 2:22:25 PM

P: 6/1/2007 3:00:37 PM
*DeeJay** Ideal Rock Total Posts: 6,491 Last Post: 9/23/2009 Member Since: 3/26/2006	Thank you all very much for these replies, and please keep 'em comming! This is very educational.
Posted: 6/1/2007 3:00:37 PM

P: 6/1/2007 4:01:37 PM
innerkitten Ideal Rock Total Posts: 2,920 Last Post: 11/21/2009 Member Since: 8/2/2003	Hmmm, wouldn't want to have a stone under go some sort of radiation every few years. I hve amethysts that have retained color just fine but I don't wear them all the time.
Posted: 6/1/2007 4:01:37 PM

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