Medium Blue

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Stagecoach 2012: the Mavericks return mightily while Luke Bryan keeps the party going (OC Register - Soundcheck)

When a band is genuinely having a good time onstage, the feeling quickly
transfers to the audience as well. That was definitely the case Saturday night
during the Mavericks' first public concert in nine years, a jewel of a
Stagecoach booking that also served as the initial stop on the band's North
American reunion tour. [...]

Stagecoach 2012: the Mavericks return mightily while Luke Bryan keeps the
party going is a post from: Soundcheck

OC Register - Soundcheck

Is my diamond real it glows medium blue it scratches glass doesnt fog is it a true diamond?

But the inlay in the earrings are loose so how much would it be worth if its a fairly big diamond

It sounds about right. your diamond should be real. Also does it rank 10 on the moh's scale?

About a third of diamonds fluorescence, like the fluorescent minerals you have seen in natural history museums, or the novelty shop toys under the black (UV) light. The effect is like a white shirt in a discotheque.

Fluorescence can be faint to very strong, and the most common fluorescent color is blue. As blue is the complimentary color to yellow, the most common tinted color in diamonds, blue fluorescence can make yellowish diamonds look white or colorless.

A GIA survey found that fluorescent diamonds were favored over non fluoro stones, especially in lower colors, but even in the higher colors (D, E and F) which are usually discounted by the trade. Many years ago D-F colorless fluorescent diamonds were highly prized and referred to as "blue-white". But sales people abused the term for any diamond with fluorescence; "blue-white" usage was outlawed by US trade practices laws.

One "for" argument for discounting fluorescent diamonds is because the GIA lab grading lights emit a small amount of ultra violet light; fluorescent diamonds might be assigned a better color grade. 'Against' this argument (anecdotally from the GIA Gem Trade Lab) is that UV light is present in many viewing environments, so why not grade color in realistic lighting?

But the most likely reason for fluoro diamond discounting is because of the sad fact that many jewellery salespeople are not able to explain complex phenomena like fluoro; a Fluoro (or any comments) written on a report makes the diamond harder to sell = worth less! Sales killing explanation: Fluorescence is visible light emitted by electrons when a diamond is excited by higher energy source (Ultra Violet light or X-rays).

Some diamonds have extremely strong fluorescence and appear oily or cloudy like the one in the picture below. This is BAD. But the GIA study found them to be very rare; they were unable to find enough cloudy stones to do a study from the 26,010 sample they used.

Rarely diamonds fluoresce another color like yellow or orange. Do not buy them unless the diamond concerned is a fancy color of the same hue as the fluorescence (which will make it more intense). Colorless diamonds with yellow or orange fluoro will appear to be a lower color when seen in light with a UV component.