Assurance
What quality certifications and memberships do you hold?
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Xiamen Yeyang Stone Group maintains official international credentials validating product quality and ethical craftsmanship:
- SGS Certification: Verifies material density, flexural strength, low water absorption, and chemical safety compliance across natural and quartz materials.
- MIA Membership: Active member of the Natural Stone Institute, demonstrating strict adherence to technical standards and international trade ethics.
These qualifications ensure top-tier quality for commercial and residential developments.
What is your standard factory quality inspection (QC) process?
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We execute a comprehensive, multi-stage quality control protocol across every production phase:
- Block Selection: Hand-selecting raw stone blocks at the quarry source to ensure veining and color consistency.
- In-Process Inspection: Monitoring automated KEDA sawing and CNC machining against approved CAD shop drawings.
- Final Pre-Packing Verification: Inspecting dimensional tolerances, edge profiles, surface polishing, and staging dry-lays.
We send high-resolution inspection photos before packing, ensuring flawless quality upon site delivery.
How do you ensure color uniformity and dimensional accuracy for large projects?
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Quality control starts at raw block selection and continues through final dispatch. By dealing directly with quarry owners and investing in 10-plus core quarries, our inspectors hand-select blocks at the source for veining and color consistency. In our factories, KEDA saws and JincYow CNC equipment process stone strictly per CAD shop drawings. Dedicated QC teams verify dimensional tolerances and surface finishes prior to packing.
Do you have direct quarry resources to support competitive pricing and long-term supply?
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Yes. We directly invest in over 10 core marble and granite quarries while holding direct pricing across 40-plus marble sources:
- Key Quarry Holdings: Castro White Marble, Roman Travertine, and China Vermont Grey Marble.
- Granite Reserves: Direct sourcing for G603, G654, G682, G684, G685, and Shanxi Black.
Direct quarry sourcing eliminates intermediary markups, ensuring cost efficiency, monthly block updates, and continuous supply.
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