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loose diamond prices, rapaport diamond price, diamond pricing, buy diamonds online, buying loose diamond, igi certifiedThe pavilion is the bottom portion of the diamond, below the girdle. The height of the pavilion greatly contributes to the diamond's overall brilliance. If the pavillion is too long or too shallow in proportion to the rest of the diamond, light will "leak" out from the bottom of the stone resulting in a duller looking diamond.
The point on the bottom of a diamond's pavilion is called a culet. During the manufacturing process, the culet is often polished as a flat facet so that it does not get chipped. These days the cutter usually ‘closes’ this facet to a point, but sometimes it remains as a small extra facet; this is not so bad because it protects the culet from chipping as the diamond is handled and while the jeweler is setting the stone. In some cases, you will read that a round brilliant cut has 57 facets, and sometimes 58; the 58th facet is the culet.
Roughly one third of diamonds available in the market fluoresce, 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 nightclub.
Fluoro 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 often discounted by the trade. Many years ago colorless fluorescent diamonds were highly prized and refferred to as "blue-white". But sales people used the term too loosely 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. The ‘against’ argument, although the GIA Gem Trade Lab has not openly discussed the issue, is that UV light is almost always present in 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 jewelry 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!
Some diamonds have extremely strong fluorescence and appear oily or cloudy. This is BAD. But the GIA study found them to be very rare; they were unable to find enough cloudy stones from the 26,010 samples 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). White diamonds with yellow or orange fluoro will appear to be a lower color when seen in light with a UV component.
When the UV light is turned off, fluorescence ceases instantly, but some stones continue to phosphoresce for a little while.
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