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Flawless Emerald Shaped Diamond Engagement RingFlawless Emerald Shaped Diamond Engagement Ring

Flawless (FL) Diamond Clarity Guide

As the highest clarity grade on the Gemological Institute of America (GIA) scale, FL diamonds are so rare that they constitute less than 1% of all gem-quality diamonds worldwide.

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Diamond clarity characteristics - SI2

Flawless Diamond Clarity Meaning

Flawless clarity means a diamond contains no internal or external imperfections visible under 10x magnification when examined by a skilled gemologist. The technical definition encompasses two critical aspects:

 

  1. Internal Characteristics: The diamond must be completely free of inclusions. That means no crystal growths, pinpoints, clouds, feathers, or any other internal features that might interrupt the crystal structure.  
  2. External Features: No surface blemishes can be present. This includes no polish lines, nicks, or scratches. Naturals (remnants of the original rough diamond surface that are considered a blemish) can still be present as long as they are only in the girdle and don’t contort the diamond’s outline.  


The distinction between Flawless (FL) and Internally Flawless (IF) is subtle but significant. While both grades indicate no internal inclusions, IF diamonds may have minor surface blemishes that can be removed through careful polishing, whereas FL diamonds are pristine both inside and out. Extra facets – considered a blemish – can also still be present in an IF diamond as long as they are not visible at 10x magnification.

Flawless Diamond Clarity Quality

The qualities of flawless diamonds extend beyond their technical perfection: 

  • Optical Performance: Without any clarity characteristics to interfere with light passing through the diamond, FL diamonds typically exhibit exceptional brilliance, fire, and scintillation.  
  • Structural Integrity: The absence of inclusions means there are no weak points within the diamond's crystal structure. This provides superior durability – though all diamonds, regardless of clarity, remain susceptible to damage from sharp impacts. 

Visual Characteristics: 

  • Complete transparency when viewed from all angles 
  • No visible imperfections, even under intense magnification 
  • Pure, uninterrupted crystal structure 
  • Maximum light returns due to flawless internal geometry
Assortment of Diamond Stud Earrings

Flawless Diamond Clarity Price

The pricing of flawless diamonds reflects their exceptional rarity and perfection. FL diamonds command the highest premium in the clarity category, typically costing more than Internally Flawless (IF) diamonds of comparable characteristics. This premium stems from their extreme scarcity in nature. The intensive selection process during sorting, and sophisticated cutting requirements to preserve flawless status, further drive their value, as does high market demand from collectors and connoisseurs.

Larger FL diamonds experience exponential price increases due to their increased rarity. The price premium for FL clarity becomes particularly significant above 1 carat, and the shape can impact price substantially, with round brilliants typically commanding the highest premiums in the market.

Variety of Flawless Diamond Engagement Rings

Flawless Diamond Clarity FAQ

Is flawless clarity good?

Flawless clarity represents the highest possible clarity grade, but its practical value depends on individual priorities. While these diamonds offer ultimate optical performance, maximum light return, and significant investment potential, practical considerations must be weighed carefully. Many VS1 and higher clarity diamonds appear identical to the naked eye, and the premium paid for FL clarity might be better invested in other characteristics like cut quality. For engagement rings, an excellent cut VVS1 diamond often provides comparable visual performance at a more accessible price point.

What is flawless diamond clarity?

Flawless diamond clarity indicates a gem that meets extraordinarily strict criteria. To achieve this grade, a diamond must be completely free of inclusions and surface blemishes when viewed under 10x magnification, displaying a perfect crystal structure throughout with no treatments or enhancements of any kind.  

The certification process requires verification by an accredited gemological laboratory through multiple expert examinations. The resulting documentation must specifically note the FL clarity grade and include a complete plotted diagram showing the absence of any characteristics. Professional gemologists examine potential FL diamonds from multiple angles under various lighting conditions to confirm their flawless status. This rigorous process ensures that only truly exceptional diamonds receive this prestigious grade, maintaining the integrity and value of this classification in the diamond market.