Services
Diamond Certificate
A full gemological report on a loose natural or laboratory-grown diamond, covering its identification, the 4Cs, measurements and fluorescence.
Gemstone Certificate
Identification of a loose coloured gemstone, with a report of any treatments detected.
Jewellery Appraisal Report
A signed valuation document for diamonds, gemstones and mounted jewellery, prepared for insurance or estate purposes. An appraisal is separate from a certificate. From €80 per piece.
Verbal Assessment
An examination of your piece with the findings given verbally on collection: whether the diamonds are natural, what the gemstones are and the metal and its karat. No written report is issued and treatments are not assessed. From €30 per piece.
Laser Inscription
On request, inscription of a certificate number, personal message or logo on the girdle of a loose diamond or gemstone.
All services are by appointment. To book, call +357 22 518130 or email [email protected].
How to Submit a Stone
- Contact us. Call +357 22 518130, send a WhatsApp message to the same number or email [email protected] to arrange your visit.
- Bring your stones or jewellery to the laboratory. We list each item and give you a written receipt.
- We examine your items. They remain with us at the laboratory and your documents are ready within 10 working days.
- Collect your items and documents. Please bring your receipt.
If a stone needs further examination, we will call you to explain before going ahead.
If testing shows that a stone is synthetic, we will inform you before any certificate is prepared, so you can decide whether you still want one. If you choose not to proceed, a verbal assessment fee applies, from €30.
Frequently Asked Questions
What is the difference between a certificate and an appraisal?
A certificate describes a stone: what it is and its quality. It does not state a price. An appraisal report gives an estimated value, usually for insurance or estate purposes. They are separate documents.
Do you certify laboratory-grown diamonds?
Yes. CGL certifies both natural and laboratory-grown diamonds, and every certificate states clearly which one the stone is.
Does my stone need to be loose?
For a diamond or gemstone certificate, yes. We do not remove stones from their settings. Mounted jewellery can be examined for an appraisal report or a verbal assessment.
Can you examine jewellery I bought elsewhere?
Yes. CGL examines stones and jewellery regardless of where they were purchased.
How long does it take?
Documents are ready within 10 working days. If a stone needs further examination, we will call you to explain.
How can I check that a CGL certificate is genuine?
Every certificate is recorded in our laboratory database and can be checked on the Verify Certificate page.
How much does it cost?
A jewellery appraisal report starts from €80 per piece and a verbal assessment from €30 per piece, including VAT. For certificate fees, please contact us.