細長いクッションカットのクラッシュアイスカットピンクキュービックジルコニアの婚約指輪

Yes. Unlike generic bulk gems with irregular sizes, all CZDIA production batches go through strict multi-stage mechanical and optical dimension grading. We control size tolerances within an industrial-level ±0.01mm to ±0.02mm matrix. This strict calibration guarantees that whether you are hand-setting a custom piece or running high-volume automated CNC micro-pave casting lines, our stones will fit your mounts flawlessly without cracking or jamming.

Most commercial jewelry utilizes low-grade (1A to 3A) Cubic Zirconia, which is mass-tumbled, resulting in rounded facet edges, structural micro-cloudiness, and a dull look over time. CZDIA uses strictly uncompromised 5A (AAAAA) Grade raw crystals. Each stone is individually hand-polished by master lapidaries under optical instruments. This ensures razor-sharp facets and flawless optical clarity that perfectly mimics the exact brilliance pattern of a D-flawless mined diamond.

Absolutely. Because we supply international premium heritage brands, all CZDIA stones are engineered to endure high-temperature industrial casting. They possess exceptional thermal shock resistance and can easily withstand standard wax setting (casting-in-place) temperatures exceeding 750°C without burning, changing color, or losing their brilliant luster.

No, CZDIA stones are guaranteed not to fade, yellow, or turn cloudy under normal wear. Low-grade CZ absorbs microscopic oils and lacks thermal stability, causing it to go dull. Our 5A-grade stones feature a highly stabilized atomic matrix with a high hardness rating of 8.5 on the Mohs scale. They block oil absorption and remain crystal clear. If they ever appear less shiny due to daily cosmetics or lotion buildup, a simple wash with warm soapy water and a soft brush will instantly restore their original fire.

It depends entirely on your design intent. Round Cuts feature the classic 57-facet Hearts & Arrows geometry, offering the highest white-light reflection (brilliance). Fancy Cuts (like Princess, Emerald, or Heart shape) offer unique, avant-garde silhouettes for modern designer statements. At CZDIA, our Fancy Cuts carry a premium craftsmanship fee due to the significantly higher raw material clipping loss and complex manual symmetry needed to match our rigid ±0.02mm setting tolerance.