Online mail-in submission is available in Mainland China. Every other region is offline only: please contact the local team first to confirm working hours and whether mailing is possible.
Submission modes and accepted gemstones by GUILD laboratory region
Submit online through our WeChat mini program and mail your stones, or deliver them in person to our Shenzhen, Guangzhou or Zhuji laboratories. Mainland China is also the only region that accepts jadeite, pearls and lab-grown diamonds; pearls are tested at the Zhuji laboratory only.
2. How would you like to submit?
Submit through our WeChat mini program
Scan the QR code with WeChat to open the GUILD online submission mini program.
Accepted gemstones
Colored Gemstones
Jadeite (Feicui)
Pearls Zhuji laboratory only
Lab-Grown Diamonds
Other items? Contact us before sending.
Enquire before you submit
Please contact the laboratory first to confirm the service, fee and receiving details before sending any stones.
Address: Rooms B0419-B0421, Building B04, Phase 1 Market, East China International Jewelry City, Shanxiahu Town, Zhuji City, Shaoxing City, Zhejiang Province, China
Available in Mainland China. You arrange everything online and only the stones travel, by mail.
01
Open the mini program
Scan the QR code with WeChat to open the GUILD online submission mini program, and choose the report you need.
02
Submit your details
Enter your submission details in the mini program: item type, quantity, contact person and return address. Our team then confirms the fee and turnaround.
03
Receive shipping instructions
Once the fee and turnaround are confirmed, we tell you which laboratory will receive your stones (Shenzhen, Guangzhou or Zhuji), its address, the contact person and packing guidance. Pearls are always sent to the Zhuji laboratory.
04
Pack and ship
Pack each stone separately and send them by tracked, insured courier. Mark the parcel with your submission reference and send us the tracking number. Unless agreed otherwise, transit risk stays with the client.
05
Reception and testing
We check your parcel on arrival and begin testing. Standard testing takes 5–7 business days from reception; express service of 1–2 business days is available, subject to capacity.
06
Report, payment and return
Settle the fee as instructed by our team. Your stones and report are returned by courier. Any GUILD report can be verified online at any time with its certificate number.
Offline submission, step by step
The same six steps apply in every region, including Mainland China. Always start by contacting the local team.
01
Contact local staff first
Before you visit or send anything, contact the laboratory in your region by WhatsApp, phone or email. Confirm working hours, any appointment, and whether mailing is possible. Tell us the gemstone type, quantity and the report you need, and we will confirm the service, fee and expected turnaround.
02
Prepare your stones
Gather your stones with a list of what you are submitting, including any known treatments or origin claims. Pack each stone separately. Mounted pieces can be tested, though mounting may limit the analysis.
03
Deliver to the laboratory
Hand-deliver your items to the laboratory at the time agreed with local staff. Only send them by tracked, insured courier if local staff have confirmed that mailing is possible and given you the receiving address and contact person.
04
Reception and registration
On arrival, our team checks the items against your submission details and records each stone before testing begins. Any discrepancy is raised with you straight away.
05
Testing and certification
Standard testing takes 5–7 business days from reception. Express service of 1–2 business days is available, subject to capacity. Results are issued as the GUILD report you chose.
06
Report and collection
Settle the fee, then collect your stones and report in person, or arrange a courier return if local staff confirm it is possible. Items not collected, or reports not paid for, may be retained after 90 days under our Terms & Conditions.
What We Accept
Accepted Gemstones
Colored gemstones can be submitted in every region. Jadeite, pearls and lab-grown diamonds are currently accepted in Mainland China only, and pearls are tested at our Zhuji laboratory only.
Colored Gemstones
Ruby, sapphire, emerald and other colored gemstones: identification, treatment detection and, where possible, an origin opinion.
Identification and grading of laboratory-grown diamonds.
Only in Mainland China
If your item is not listed here, please contact us before sending it.
Before You Send
Submission Checklist
A few minutes of preparation prevents most delays.
Know what you are submitting
Gemstone type, quantity and the report you need. Not sure which report fits? Ask us before sending.
Disclose what you know
Share any known treatments, repairs or origin claims. Our Terms ask clients to disclose all known facts about the item.
Loose or mounted
Loose stones allow the most complete analysis. Mounted pieces can be tested, but mounting may limit the results.
Your contact details
Name, company if any, phone, email and a return address, so we can reach you and return your items.
Pack and insure
Pack each stone separately. If local staff have confirmed that mailing is possible, use a tracked, insured courier. Unless agreed otherwise, transport risk is borne by the client.
Confirm before you visit or ship
Check with local staff first: working hours, appointment, whether mailing is possible, and the receiving address and contact person.
Reports & Fees
Choose Your Report, Confirm Your Fee
Fees depend on the report type, the gemstone category and the laboratory region. Price lists are published on each report page, and our team confirms the final quote before you submit.
Online mail-in submission is currently available in Mainland China only, through our WeChat mini program. In Hong Kong, Bangkok, Beruwala and Los Angeles, submission is offline only. Please contact the local staff first to confirm working hours and whether mailing is possible.
Which gemstones can I submit, and where?
Colored gemstones are accepted in all five regions: Hong Kong, Bangkok, Beruwala, Mainland China and Los Angeles. Jadeite (feicui), pearls and lab-grown diamonds are accepted in Mainland China only, and pearls are tested at our Zhuji laboratory only.
How long does testing take?
Standard testing typically takes 5–7 business days from the date of reception. Express service is available for urgent requests, with turnaround as short as 1–2 business days, subject to availability.
How much does testing cost?
Fees depend on the report type, gemstone category and laboratory region. Price lists are published on each report page, and our team confirms the final fee before you submit.
Can I mail or ship stones to a laboratory?
In Mainland China, yes: online mail-in submission is supported. In every other region, submission is offline only, and whether stones can be mailed depends on the local laboratory. Please contact the local staff first and do not ship before they confirm. Cross-border shipments are subject to customs rules, and transport risk stays with the client unless otherwise agreed.
Can I submit mounted jewelry?
Yes. Mounted pieces can be tested, but mounting may limit complete analysis, and the report describes the results insofar as the mounting permits.
Does GUILD buy or sell gemstones?
No. GUILD is an independent laboratory and does not engage in gemstone trading, brokerage or any commercial activity involving the stones it certifies.
What happens to stones I do not collect?
GUILD may retain items that are not collected, or whose report fee has not been paid, after 90 days from submission. See the Terms & Conditions on the Laboratories page for details.
Ready When You Are
Ready to Submit Your Gemstones?
Select your region to see the route that applies to you and the laboratory to contact. Remember to confirm with local staff before you visit or send anything.
