Hi.I recently purchased a 1.8, round, F color, VS2, GIA certified stone. I was under the assumption that F color diamonds appear colorless (white)in all lighting. Is this true in the sun as well?? How about in flouresent lighting?? The stone seems to show a hint of yellow in these lighting conditions.How do I find out if the stone is definetly an "F"?One more question....The jeweler had to change the basket on my platinum setting in order to accomodate the stone. Now the seems where the basket was soldered to the setting are turning yellowish. The jeweler said that they had to use low content platinum solder so they wouldn't destroy the setting, which is all channel set baguettes. Has the durability of the setting now been compromised??? How about the beauty???Thanks for the advise.