How to Verify Chinese Stone Suppliers: 15-Point Checklist

Why Supplier Verification Is Critical

The difference between a profitable stone import business and a warehouse full of unusable material often comes down to one decision: which supplier you chose. The Chinese stone industry includes some of the world's finest manufacturers — ISO-certified factories producing stone for landmark projects globally — alongside traders with no quality control who disappear after a single disputed shipment.

This checklist provides a systematic, practical method for evaluating any Chinese stone supplier. It is based on real-world experience: Phoenix Power Stone has been manufacturing and exporting stone for 26+ years, and we know exactly what legitimate factories look like — because we are one.

Part 1: Pre-Visit Verification (Before You Travel)

Complete these checks remotely before committing to a factory visit or trial order.

✅ 1. Business License Verification

Request a copy of the supplier's business license (营业执照). Key fields to check:

• Registered business scope (经营范围) — Must include "manufacturing" (生产, 制造, 加工), not only "trading" (贸易, 销售)
• Registered capital (注册资本) — Below ¥1 million RMB suggests a small operation; ¥5 million+ is typical for mid-size factories
• Establishment date (成立日期) — Longevity is a positive signal. Factories operating 10+ years have survived multiple industry cycles.
• Registered address — Should be in an industrial zone, not a residential area or virtual office

Cross-reference the business license number on the National Enterprise Credit Information Publicity System (国家企业信用信息公示系统) at gsxt.gov.cn.

✅ 2. Export License Check

Does the supplier hold a valid import/export license? Without one, they must use an export agent, which adds cost and complicates documentation. Ask directly: "Do you handle export documentation yourself or through an agent?"

✅ 3. ISO and Quality Certification Verification

Common certifications for stone factories:

• ISO 9001:2015 — Quality management system. Verify the certificate number on the certifying body's website (SGS, TÜV, Bureau Veritas).
• CE Marking (EN standards) — Required for construction products sold in the EU. Verify the notified body number on the CE certificate.
• ASTM Test Reports — For US-bound products. Reports should be from an accredited independent lab, not the factory's own testing.

✅ 4. Reference Clients — And How to Verify Them

Ask for 3-5 reference clients, including at least one in your country or region. A legitimate factory will provide these without hesitation. Then:

• Contact the reference directly. Ask: "Would you order from this supplier again? Were there any quality or delivery issues?"
• Check if the reference is genuinely independent — suppliers sometimes list their own trading subsidiaries or friends as "references."
• Search the reference client's website for the supplier's company name.

✅ 5. Online Presence and Digital Footprint

• Website quality — A professional multilingual website with real product photos (not stock images), factory address, and team information is a positive signal.
• Google Maps / Baidu Maps satellite view — Look up the factory address. Can you see actual production buildings and block yards, or is it an empty lot / office tower?
• Industry platform presence — Check Alibaba, Made-in-China, StoneBTB profiles. How long have they been active? What is their transaction history? Are there verified badges?
• Negative reviews and complaints — Search "[company name] complaint" and "[company name] scam" in English and Chinese.

Part 2: On-Site Inspection (Factory Visit)

If possible, visit the factory. If you cannot travel, hire a third-party inspection company — the $300-500 investment is negligible compared to the cost of a bad shipment.

✅ 6. Production Equipment Check

Watch the equipment in operation. Idle, dusty, or visibly broken machinery suggests low production volume or poor maintenance.

✅ 7. Raw Material Inventory

Walk the block yard. A healthy factory maintains significant raw block inventory — at minimum, hundreds of blocks in multiple colors and varieties. Ask: "Where are these blocks from? How long have they been in the yard?" (Freshly quarried blocks need time to cure and release internal stress.) A nearly empty block yard means the factory buys blocks to order, which increases your lead time and cost.

✅ 8. Quality Control Process — The Walkthrough Test

Ask the factory manager to walk you through their QC process for a typical order. A good factory has a structured, multi-stage process:

1. Incoming block inspection — Visual check for cracks, veins, discolorations before cutting
2. After-cutting inspection — Slab/tile sorting by quality grade (A/B/C)
3. After-polishing inspection — Gloss meter check, surface scratch scan
4. Dimensional check — Calibrated measurement of thickness, squareness, dimensions
5. Pre-packing inspection — Final visual check before crating, photo documentation for client
6. Loading supervision — Container loading verification, crate condition check

If the answer is "we check everything at the end," that is a red flag. Quality must be inspected at every stage.

✅ 9. Sample Matching

Bring your approved sample (or photos of it) and ask to see the actual block or current production that matches it. A factory that can show you ongoing production in a color/finish matching your sample demonstrates genuine control over their supply chain.

✅ 10. Packaging and Loading Area

Check the packing area for:

• ISPM-15 stamped/heat-treated wooden crates
• Protective interleaving material between polished slabs
• Proper strapping and corner protection
• Organized loading dock with forklift access
• Weather-protected packing (stone should not be packed in the rain)

Part 3: Due Diligence Deep Cuts

✅ 11. Bank Reference and Financial Stability

For orders exceeding $50,000, request a bank reference letter. While Chinese companies may be reluctant to share full financials, a bank reference confirming a long-standing account with good standing is a reasonable request.

✅ 12. Contract and Terms Review

Before placing any order, ensure your purchase contract specifies:

• Detailed product description (stone name, color, finish, dimensions, thickness tolerance)
• Quality standard (ASTM C615, EN 12057, or specific test criteria)
• Quantity and acceptable over/under-run percentage (industry standard is ±5-10%)
• Unit price and total value in agreed currency (USD is standard for Chinese stone exports)
• Incoterms (FOB Qingdao/Xiamen is typical)
• Production lead time and shipment deadline
• Payment terms (30/70 T/T is standard)
• Inspection rights (your right to inspect before shipment)
• Dispute resolution mechanism (arbitration in a neutral jurisdiction is ideal)

✅ 13. Communication Quality

Good suppliers communicate clearly and proactively. Warning signs:

• Slow response (3+ business days without reply to a straightforward question)
• Evasive answers to direct questions about factory ownership, production capacity, or reference clients
• Overpromising — "We can produce any quantity in any timeline" without asking about your specific requirements
• No English-speaking staff — While not disqualifying, be aware that all technical specs, contract details, and quality standards must be understood precisely. Misunderstandings are costly.
• Pressure to pay quickly — Legitimate factories do not rush new clients into large deposits.

✅ 14. Competitor Cross-Reference

Contact 1-2 other suppliers of the same stone type and ask about your target supplier. The Chinese stone industry is a tight-knit community. Competitors often know which factories are reliable and which have quality or delivery problems. Phrase it diplomatically: "We are evaluating several suppliers, including [name]. Can you tell us how your quality compares?"

✅ 15. Trust Your Instincts

If something feels wrong — an address that does not match, certification numbers that cannot be verified, prices that are too good to be true — it probably is. The cost of walking away from a suspicious supplier is zero. The cost of a bad shipment can run into tens of thousands of dollars.

The Red Flag Summary