TL;DR: A CAD render and the finished ring should match closely in proportion and design, but small differences are normal: render lighting is more even than real-world light, metal reflects and ages differently than a rendered surface, and genuine stone inclusions and colour are more apparent in reality than in a simplified render.
Why This Question Is Worth Asking Before Approval
A CAD render is the point where you approve a design before production, so it's worth understanding what it does and doesn't accurately represent — the render should be trusted for proportion and structure, but not necessarily for exact light performance or stone appearance.
Lighting Is the Biggest Difference
CAD renders typically use simplified, even studio-style lighting to clearly show the design's shape and proportions. Real jewellery photography, and real daily wear, involves much more variable lighting — direct sun, indoor bulbs, shade — which affects how a stone sparkles and how metal reflects in ways a render doesn't fully replicate.
Metal Finish Renders Differently Than It Photographs
A render's metal surface is a simplified simulation of reflectivity, whereas real polished metal has a more complex, responsive quality to light that shifts constantly as the ring moves. This is a genuine, expected difference — not a sign the render was inaccurate.
Real Stones Have More Visible Character
A CAD render typically shows a generic, idealised stone rather than the exact inclusion pattern and precise colour of your specific certified stone. This is why viewing the actual stone via photography or video, separately from the design render, matters — the render tells you about the setting; the stone photography tells you about the stone.
What Should Match Closely
Proportions, prong placement, setting height, band width, and overall design structure should all match closely between render and finished ring — significant differences in these areas would be a genuine concern worth raising, unlike the expected differences in lighting and material rendering described above.
What to Ask Before Approving a CAD Render
Confirm you're looking at the design's structure and proportions rather than expecting the render to show exactly how your specific stone will look in daily light — and ask separately to see photography or video of your actual stone if you haven't already.
CAD and Stone Review at À Vie Diamonds
We provide both a detailed CAD render for design approval and separate photography or video of your actual stone, so you're reviewing the right information for each. Get in touch to discuss a commission.
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Frequently Asked Questions
Will my finished ring look exactly like the CAD render? The proportions and structure should match closely. Lighting, metal reflectivity, and the specific stone's appearance will look somewhat different, since renders use simplified lighting and a generic stone representation.
Should I be able to see my actual stone before it's set, not just the render? Yes — ask for separate photography or video of your specific certified stone, since the CAD render typically shows a generic stone representation rather than your exact stone's characteristics.
Last reviewed: July 2026 · À Vie Diamonds