Certified Lab-Grown Square Cushion Diamonds
Frequently Asked Questions (FAQs)
All three are square shapes but suit different retail positioning. Princess cuts are contemporary with sharp corners needing V-prong protection, square radiant cuts are contemporary with cropped corners, and square cushions are vintage-positioned with softly rounded corners. LabGems holds IGI-certified square cushion cuts in active Antwerp inventory.
Choose modified brilliant for contemporary clients with vintage tastes who want heightened scintillation, and standard cushion for authentic heritage and Edwardian-revival positioning with broader chunky facets. LabGems carries both faceting styles in square cushion cuts, with the wider elongated cushion cut range available for non-square proportions.
Yes. Square cushions feature in the LabGems coloured lab-grown diamonds collection across pink, blue, green and orange saturations, in-stock from 0.13ct to 9.00ct. Coloured stones price roughly 70% below natural fancy colour, with IGI certification included from 0.30ct upward, suiting heritage-revival coloured retail.
Square cushion cuts at LabGems span approximately 0.30ct through 4.00ct, with both modified brilliant and standard cushion faceting represented. Standard sizes ship within 1 business day; custom specifications ship within 7-10 business days. For a contemporary cropped-corner square alternative, LabGems also stocks the certified square radiant.
LabGems supplies square cushions both IGI-certified and non-certified, with non-certified wholesale stock pricing around 20% lower than certified equivalents. Browse real-time IGI-certified square cushion availability by carat, colour and clarity through the certified diamond search platform, which reflects live Antwerp inventory.
Square cushion cut lab-grown diamonds combine classical square symmetry with softly rounded corners, producing an iconic silhouette that bridges vintage romance and contemporary elegance. Defined by strict length-to-width ratios between 1.00 and 1.05, square cushions offer a balanced alternative to sharp-cornered princess cuts and cropped-corner radiants. For trade buyers, square cushions represent essential inventory for vintage-inspired bridal collections, halo mountings, and solitaire designs. LabGems holds IGI-certified square cushions in active Antwerp stock for direct trade allocation.
Sourcing and Specifications
Active Antwerp inventory spans square cushions from approximately 0.30ct through 4.00ct across D to J color grades and VVS1 to SI2 clarity levels. All certified stock is supplied with IGI documentation detailing complete 4Cs grading, polish, symmetry, and precise proportion measurements. Standard sizes ship within 1 business day following payment verification; custom specifications ship within 7 business days. A €500 minimum applies across all certified diamond purchases. Browse real-time stock through the certified diamond search platform.
Faceting Style: Modified Brilliant vs Standard Cushion
Square cushions divide into two distinct faceting styles. Modified brilliant cushions feature additional pavilion facets beneath the table to create fine, rapid scintillation similar to a round brilliant. Standard (antique) cushions feature larger, chunkier facets that reference old-mine cuts, producing broad flashes of light and rich color dispersion. Modified brilliant suits contemporary clients seeking maximum sparkle in a soft square footprint; standard cushion suits heritage, Edwardian, and Art Deco design contexts. Trade buyers should align faceting selection with their target retail aesthetic.
Square Ratio Control and Setting Adaptability
Maintaining a strict length-to-width ratio (1.00 to 1.05) is crucial for preserving the square cushion's balanced face-up geometry. Ratios above 1.06 begin reading as elongated rectangular cushions; for elongated inventory, explore the broader cushion shape collection. The square cushion's rounded corners make it exceptionally versatile, fitting seamlessly into four-prong solitaires, vintage milgrain bezels, and pave halo mountings. For alternative square brilliant options, review square radiant cuts or non-certified fancy shapes.
Selection Notes for Square Cushions
- Enforce 1.00–1.05 L:W ratio for true square proportions
- Choose modified brilliant for contemporary sparkle or standard for antique character
- Require Very Good or Excellent symmetry for uniform corner curvature
- Pair with halo or hidden-halo mountings for maximum vintage retail appeal
- Combine with other shapes to satisfy the €500 minimum purchase requirement