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Clarity

DIAMOND

CLARITY

Inclusions found on a diamond can be considered nature's birthmarks, the diwstinguishing characteris5tics that make the stone unique

When grading a diamond, the amont of inclusions and blemishes has a direct impact onits clarity and value. Flawless diamonds containing no inclusions are extremely rare and very expensive.


SCALE

The Gemological Institute of America (GIA) grades diamond clarity on an 11 point scale ranging from Flawless and internally Flawless (FL/IF) to included (11, 12, 13). These categories are founded upon the ability to see inclusions under 10 x magnifications.

'EYE CLEAN' DIAMONDS

Those who prefer a colorless diamond should select a stone in the D-F range witha fluorescence rating of "None" or "Faint".
Compared to other shapes, brilliant round cut diamonds of all color grade appear brighter due to their greater light dispersion.

FLUORESCENCE

WHAT?
AN EFFECT ULTRAVIOLET (UV)
LIGHT HAS ON A DIAMOND
When UV light strikes diamonds with fluorescent properties, the stone emits a glow that is usually blue.
Howeve, it can also reflect shades of green, yellow, white, pink, orange and red.
The presence of fluorenscence can enhance the visual appeal of a diamond with a lower colour reting in the J through M range.

Fluorenscence also helps to cancel out any faint yellow visible in a stone, resulting in a colorless appearance.

INTENSITIES

Fluorescence can occur in different intensities. Gemological laboratories rate the fluorescence of each diamond on a scale of None, to Very String.
1
No fluorescence,
no colour influence
NONE, NIL, NEGLIGIBLE
2
Week fluorescence,
insignificant colour influence
FAINT, SLIGHT
3
Average fluorescence,
small colour influence
MEDIUM
4
Strong fluorescence,
substantional colour influence
STRONG, EXTREMELY STRONG

THE FLUORESCENCE EFFECT

Fluorescence can enhance or detract from the beauty of a diamond. The bluish tint can improve a lower-color diamond (J-M color rated) by cancelling out the faint yellow, resulting in a colorless appearance.

However, in a very high-color diamond (D-F color rated), fluorescence may have the opposite effect.

HOW DOES FLUORESCENCE AFFECT PRICING?

Historically, strongly fluorescent diamonds have been marked down in price next to their non-fluorescent counterparts.
Typically, higher color (D-H) non-fluorescent diamonds will sell for 10-30% more than similar stones that exhibited very strong blue fluorescence.
However, lower color (I-N) diamonds with very strong fluorescence were priced 5% higher than similar non fluorescence stones. This could be due to the perception that blue fluorescence can mask the undesirable yellow tones found in some stones.