VS1, VS2 or VVS? Choosing diamond clarity and D–F colour sensibly.

What the clarity labels describe

The conventional clarity scale evaluates internal inclusions and surface blemishes at 10× magnification. VVS1 and VVS2 describe very small characteristics that are difficult for a skilled grader to see. VS1 and VS2 describe minor inclusions; within those paired categories, the 1 grade is the higher assessment. The nature, location and visibility of characteristics matter, not just their number.

That is a controlled grading assessment, not a promise that any observer in any lighting will have an identical experience. Use the actual report format: newer GIA colourless laboratory-grown assessments use different overall terminology, so this article’s grade comparison is not a conversion table for them.

Technical references: [1], [2]

Make “eye-clean” a specific question

Ask what the seller means by eye-clean. From the face-up view? At a normal wearing distance? Without magnification? Under which lighting and for whose eyesight? A useful answer gives the observation conditions and identifies the actual candidate rather than promising that an entire grade category will look identical.

A magnified image can make a tiny inclusion look dominant. Equally, a small compressed video can hide a feature you would notice in person. Request both a practical face-up view and enough detail to understand the position of reported features. If transparency or durability is a concern, have the stone assessed by a qualified professional rather than diagnosing it from an image.

Technical references: [1]

Review the inclusion pattern in your chosen shape

Use the selected cutting style as the viewing context. Look at a step-cut candidate through its actual face-up facet pattern, and compare a brilliant-cut candidate in movement. Do not treat a report plot as a literal photograph: its symbols help document characteristics, but the visual effect needs separate review.

This leads to a better upgrade question. Instead of “Is VVS always worth it?”, ask “What observable or documented improvement am I paying for between these two stones?” A higher clarity preference can be entirely reasonable, but it should be a deliberate priority rather than a substitute for seeing the stone.

D, E and F: compare in a controlled way

The conventional D-to-Z scale describes colour depth, with D at the colourless end. In that system, D, E and F belong to the colourless range. Small distinctions are assessed under controlled conditions. A screen photograph taken under unknown light is not an independent colour grading tool.

Compare candidates under the same neutral lighting and, where possible, alongside the intended metal and side stones. White balance, reflections and a tinted background can distort an online impression. Do not declare a stone misgraded from one photograph; request better evidence or an appropriate professional comparison.

Technical references: [3], [4]

An upgrade framework that keeps the ring in view

Build a shortlist that satisfies your non-negotiable requirements first. Compare an acceptable candidate with the proposed upgrade, keeping shape, weight and documentation as comparable as practical. Record the price difference and what you gain. If several variables change at once, do not attribute the whole improvement to one grade.

Do not compensate for a disliked outline or lifeless appearance by buying a higher clarity label. Finish the selection with actual-stone review and a written specification. At Casta Diva, displayed grade ranges are preferences for sourcing, not a promise that every candidate in the range has the same quote or appearance.