Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
Here is my yellow beauty. Isn't it cute ! In one picture it lays on its table, in the other on its pavilion. Well, I think I have decided I like it anyway, whether irradiated or not !
Joined: Tue Jun 03, 2008 4:40 pm Posts: 2667 Location: South Dakota
upcyclist wrote:
Barbra Voltaire wrote:
I would not personally rely on "sight" determination.
Yes, Barbra would greatly prefer the Chelsea Filter ::ducks::
Hahahahahahaha classic, UPC..just classic. I have a great picture of Vietnamese aquamarine right next to irradiated heliodore.....exact same vietnamese aqua just that it had been zapped and was yellow...the picture is on my other computer
_________________ MrAmethystguy ~ Some jokes just fluorite over my head!
Many of the bright yellow or slightly brownish "golden" beryls have been irradiated. Just a short burst of gamma or electron beam irradiation is enough to color goshenite. According to Tom Schneider, irradiation expert and colored gem importer in San Diego, the accidental discovery of irradiated beryl came while irradiating colorless topaz. As the topaz was slowly turning blue, the goshenite—which had been accidentally mixed in with the topaz—was quickly turning bright yellow.
Different mines yield different material, notes Schneider—even though it may all look like the same goshenite, it can contain different trace elements that react uniquely to the irradiation process. Some irradiated beryls become a bright lemony yellow, while others become a more golden color. According to Schneider, golden beryl is much more salable and attractive.
On rare occasion, irradiation produces pink morganite. While irradiation-processed color is stable, Schneider does try to "bleach" the stones in the San Diego sun to test for fading.
Joined: Wed Jan 23, 2013 5:29 pm Posts: 1047 Location: Paris
As for the color stability, I intend to wear this stone as a pendant, outdoors, next summer, so I'll be able to notice if the color fades or not, and will keep you informed !
By the way, I have a crystal out in a sunny spot. After two and a half sunny days (plus a cloudy one), it has not faded at all, but I'll leave it there for a week or so.
OK, I left the stone out for about a week. Most of the days were sunny, though there were one or two cloudy days. Regardless, the stone has not noticeably faded. As a side-note, while looking at the rest of the stones in the parcel I noticed one of them, when looked at down the length, has an orange core with a yellow rind. Not necessarily relevant to anything, but kind of neat. None of the others showed noticeable zoning like that.
I like this seller's stock, but all information points to them being irradiated. There does not appear to be any known source of natural yellow beryl in Vietnam, but there are ample reports of stones being irradiated to produce the color. Tuan always has nice-looking stuff at reasonable prices. Generally not cheap enough for me to bite, but usually close.
All my yellow beryls are 100% natural,no heat or treatment any way. I've bought them from Miners that working at natural mines at the Border of Vietnam,Laos,Cambodia I've not any proof for them to show you,but i've checked by gems Lab in Hanoi Vietnam and Gems Lab in Chia All 're no heated. Thank you
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