Cushion Cut Loose Diamonds

Start with proportion — decide whether you prefer a square cushion (length-to-width ratio 1.00 to 1.05) or an elongated cushion (ratio 1.10 or higher). Square cushion is classic and versatile; elongated cushion creates a more finger-lengthening silhouette that has grown in popularity for engagement rings. Then consider color grade — G and H color grades appear very similar to D-F in cushion cut due to the shape's diffused light return. VS1 to VS2 clarity is the recommended range for engagement ring center stones. Viewing the stone in person is the most reliable way to assess proportion and clarity.

Both are popular engagement ring choices. Square cushion (ratio 1.00 to 1.05) is classic and suits virtually any setting style. Elongated cushion (ratio 1.10 or higher) visually lengthens the finger and has grown significantly in popularity in recent years. The right choice depends on personal preference and hand shape — trying both in person makes the decision much easier than comparing photographs.

Yes, generally. Cushion cut's larger facets diffuse light across the stone's surface rather than concentrating it, which means color is less perceptible than in some other shapes. G and H color grades appear very similar to D-F in most cushion cut stones and settings. This makes cushion cut a particularly good choice for buyers who want to allocate more budget toward carat weight or clarity without a visible compromise in whiteness.

Yes. All cushion cut loose diamonds at Weiss carry GIA or CGL certification, which documents color grade, clarity, carat weight, and symmetry. The symmetry grade is particularly relevant for cushion cut as it affects how uniformly the stone's outline reads — whether it appears evenly balanced or slightly irregular.

Yes. After selecting a cushion cut loose diamond, our craftsmen can create a custom ring in your preferred setting style — solitaire, halo, three-stone, or other designs — in 18K white gold, yellow gold, rose gold, or platinum. We can produce a design sketch before committing to production. Contact us to discuss your requirements.

Yes. Our appointment-only office is in Okachimachi, Tokyo. For cushion cut in particular, viewing in person allows you to assess the proportion difference between square and elongated stones directly, and to evaluate how the stone's brilliance looks in natural versus artificial light. Please book an appointment through our contact page or by phone.

Cushion cut is one of the best shapes for fancy color diamonds. Its larger facets allow the stone's color to express itself with depth and richness — which is why cushion cut yellow and pink diamonds are among the most popular combinations in fine jewelry. If you're interested in a cushion cut fancy color diamond, browse our fancy color diamond ring collection or contact us about loose color diamond availability.