Diamond cut describes how effectively a polished diamond’s proportions, facet arrangement, symmetry and finish work together to return light. It is different from diamond shape, which describes the outline such as round, oval or emerald.

Cut has a direct effect on brightness, fire and scintillation. A well-cut diamond can look lively and visually engaging, while a poorly proportioned stone may appear dark or lifeless even when its color and clarity grades are high.

No. Shape is the outline viewed from above. Cut quality concerns light performance, proportions and craftsmanship.

For standard round brilliant diamonds within the applicable grading range, GIA uses Excellent, Very Good, Good, Fair and Poor.

GIA’s overall cut grade is primarily used for standard round brilliant diamonds that meet its grading criteria. Fancy shapes are evaluated through measurements, symmetry, polish, facet pattern and visual comparison rather than relying on one universal overall cut grade.

Triple Excellent commonly means Excellent Cut, Excellent Polish and Excellent Symmetry on a GIA grading report for a round brilliant diamond.

It is a strong screening standard, but diamonds with the same report grades can still differ in proportions, optical symmetry, contrast pattern and overall visual character. Side-by-side comparison remains valuable.

Brightness is the combined internal and external reflection of white light from the diamond.

Fire is the dispersion of white light into flashes of spectral color.

Scintillation is the sparkle seen as the diamond, viewer or light source moves, together with the pattern of light and dark areas across the stone.

Polish evaluates the quality of the facet surfaces. Symmetry evaluates the precision of facet shape, alignment and placement.

Hearts and Arrows refers to a precise optical pattern that may appear in well-proportioned round brilliant diamonds when viewed with a specialized viewer. The pattern indicates strong optical symmetry, but it should still be assessed alongside overall light performance.

It may look more visually open and lively because light returns efficiently, but physical face-up size depends on millimeter diameter, depth and weight distribution.

Yes. An overly shallow combination of proportions may allow light to escape rather than return toward the viewer, and may create distracting visual effects.

Yes. Excess depth can hide weight below the girdle, reduce face-up spread and contribute to darkness or light leakage.

Table percentage compares the width of the top table facet with the diamond’s overall width. It is one part of a proportion system and should not be judged alone.

Depth percentage compares total depth with average width. It helps explain weight distribution and face-up size, but must be interpreted together with crown and pavilion relationships.

The crown angle describes the angle of the crown facets above the girdle. It influences fire, brightness and the balance of the facet pattern.

The pavilion angle describes the angle of the lower facets beneath the girdle. Small differences can meaningfully affect how light returns through the top of a round brilliant diamond.

For an engagement ring center stone, many buyers prioritize Excellent cut when the budget allows. A carefully selected Very Good stone may still be attractive, but it should be compared in person or through reliable imagery.

Round brilliant diamonds are engineered for strong, balanced brilliance and have the most standardized cut evaluation. Other brilliant-style shapes can also sparkle intensely, but performance varies more from stone to stone.

Review brightness, symmetry, outline, bow-tie visibility, length-to-width ratio and face-up measurements. Compare several stones because fancy shapes vary considerably.

A bow-tie is a dark or contrasting band that can appear across elongated brilliant shapes such as oval, pear and marquise. Some contrast is normal; the concern is when it dominates the stone.

A setting changes how much of the diamond is visible, how it is protected and how surrounding diamonds contribute to the overall look. The center stone’s intrinsic cut quality remains the main source of its light performance.

A solitaire puts the center diamond on display, so cut quality, symmetry and face-up pattern become especially noticeable. Round, oval, emerald, pear, radiant and cushion shapes can all work beautifully when individually selected.

Matched round brilliant diamonds are popular because they provide balanced sparkle. For studs, prioritize visual matching, face-up size and overall brightness rather than chasing tiny grading differences that are difficult to see at normal viewing distance.

Round brilliant diamonds are versatile for pendants and tennis necklaces. Pear, emerald, marquise and heart shapes can create a more distinctive focal point. Movement, orientation and secure setting design also matter.

Fluorescence and cut are separate characteristics. Cut concerns light interaction created by proportions and workmanship, while fluorescence is a diamond’s response to ultraviolet light.

Match the report number and measurements to the selected diamond and use GIA Report Check. Where laser inscription is present, a trained professional can help confirm it under magnification.

Certification depends on the selected diamond and product specifications. Ask the S.Diamond team to confirm the grading report, certificate coverage and stone details for the exact piece you are considering.

Side-by-side viewing helps reveal differences in brightness, contrast, outline, apparent size and personality that may not be fully captured by report grades alone.

S.Diamond offers natural diamond jewelry and private consultations at its CentralWorld boutique on the 1st Floor, Jewelry Zone, Bangkok.