25 Carat D Flawless Cushion Cut Diamond Ring
The center stone is a 25.36-carat D Flawless Type IIa Cushion cut natural diamond, GIA certified (Rosenberg ref. 95904). Diamonds of this weight in D Flawless represent a near-singular occurrence in annual GIA submissions — a 25-carat-plus colorless Flawless stone is encountered perhaps a handful of times per decade on the open market, placing this piece in a category where supply is structurally limited by the geology of diamond formation itself.
GIA Color and Clarity: D Flawless, Type IIa Classification
D is the highest grade on GIA’s D-to-Z colorless scale, indicating the complete absence of detectable body color under controlled laboratory conditions. Flawless is the apex of the GIA clarity scale: no inclusions or blemishes are visible under 10× magnification by a trained grader. Type IIa is a mineralogical classification, not a GIA color or clarity grade — fewer than 2% of gem-quality diamonds qualify, denoting an exceptionally pure, nitrogen-free crystal lattice that transmits light with minimal internal absorption, a property that becomes perceptibly significant at this carat weight.
Why Cushion Cut at Extreme Carat Scale
The Cushion cut’s rounded corners and larger facet planes distribute mechanical stress evenly across the girdle, reducing edge vulnerability in a stone where structural integrity carries significant consequence. At 25 carats face-up, the modified brilliant facet pattern produces broad, open light return — a visual proportion appropriate to the stone’s scale rather than the concentrated scintillation of smaller brilliant cuts. Historically significant diamonds have disproportionately appeared in Cushion form precisely because the geometry preserves maximum weight from large rough crystals while maintaining optical performance.
Three-Stone Platinum Setting with Heart Shape Side Stones
Two D Flawless Heart Shape diamonds, 3.22 carats total weight, flank the center stone in a calibrated matched-pair configuration. Heart Shape diamonds require precise bilateral symmetry to achieve defined lobe separation — sourcing D Flawless examples at matched weight for side-stone placement represents a standard rarely applied at this tier. The mount is handmade platinum, selected for its 95% purity, density, and long-term prong retention required to secure a center stone of this magnitude across decades of wear.
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Care
Preserve the brilliance of your diamond through proper care. We recommend professional cleaning annually and safe storage in a jewelry box or pouch. Avoid exposure to harsh chemicals and extreme temperatures. Learn more about our complete care guide for detailed maintenance and storage best practices.
Warranty
Every Rosenberg piece comes with a warranty covering craftsmanship and authenticity. Our warranty protects against manufacturing defects and ensures your diamond’s certified quality. For warranty details, claims, or to register your purchase, contact our specialists.
Delivery
Your diamond is shipped via insured, tracked delivery with full insurance coverage included. Packages are carefully packaged in premium materials and require a signature upon delivery. Review our shipping and delivery policy for complete details about timelines and handling.