A diamond cold laser inscription is a process where a laser is used to etch a unique identifier, such as a serial number, logo, or personalized message, onto the girdle (the outer edge) of a diamond. This inscription is typically microscopic and can be used to verify the diamond’s authenticity, its grading report, or other key information.
Key Features of Cold Laser Inscription:
Laser Technology:
The cold laser used in the process is a low-energy laser that does not generate enough heat to affect the diamond’s structure or its inherent properties.
Unlike traditional laser etching methods that can produce heat or cause microfractures, cold lasers use a precise, controlled beam to mark the diamond without damaging it.
Precision:
Cold lasers are capable of engraving extremely fine details that are invisible to the naked eye but can be magnified with a loupe or microscope.
The engraved text or design is typically small, with high precision, often ranging from 1 to 2 millimetres in length.
Purpose:
The primary purpose of cold laser inscriptions is to provide a form of identification that links a diamond to its grading report or to prove its authenticity. This can help to confirm the diamond’s origin, its quality grade, and its specific characteristics as detailed in the accompanying grading document.
It is also used by jewellers to add personalized messages, such as initials, dates, or sentimental inscriptions, making the diamond more meaningful to the buyer.
Common Types of Inscriptions:
GIA (Gemological Institute of America) Serial Number: Many diamonds graded by the GIA are inscribed with their unique serial number that corresponds to the report issued by the institute.
Personal Messages: Some buyers opt for personalized engravings, such as initials, special dates, or short phrases.
Brand Logos: Some jewellery brands may include their logo or trademark on the diamond for brand identification.
Certification Details: Other information, such as the diamond’s cut, colour, and clarity, may also be inscribed to help identify and verify the diamond’s grading.
Location of Inscription:
The girdle of the diamond is the most common location for cold laser inscriptions because it’s the outer edge of the diamond, making it easy to access without damaging the table or other more delicate areas.
The inscription is typically placed in an area that is not visible when the diamond is set in jewellery.
Advantages of Cold Laser Inscription:
No Damage to Diamond: Since the cold laser process uses minimal heat, it does not affect the diamond’s structural integrity or cause any physical damage to the stone.
Permanent and Invisible: The engraving is permanent and does not wear off. It is also invisible to the naked eye, meaning it won’t affect the aesthetic appeal of the diamond.
Adds Value: An inscription can add a layer of authenticity and security, ensuring the diamond can be identified and traced back to its grading report.
Customization: Cold laser inscriptions allow for personalized engravings, making the diamond a unique and meaningful piece of jewellery for the buyer.
Visibility and Inspection:
Microscopic Inspection: While the engraving is usually invisible to the naked eye, it can be easily seen under magnification using a loupe or a microscope.
Some diamond grading labs, like the GIA, will include the serial number or specific laser inscription details in their reports, which can be used to identify the diamond by its unique marking.
Considerations When Using Cold Laser Inscriptions:
Impact on Resale Value: Generally, cold laser inscriptions do not affect the resale value of a diamond, but they provide added security for the owner, as the diamond can be traced back to its certificate. However, if the inscription is highly personalized or specific, it may limit the market for resale.
Verification: If you are buying a diamond with a laser inscription, make sure that the inscription matches the details listed in the certification or grading report. Reputable diamond grading laboratories often verify the inscriptions, and a matching number helps to confirm authenticity.
Customization Limits: Cold laser inscriptions are limited in size, and large, complex designs or messages might not fit in the small area available on the girdle. However, simple messages, dates, or identifiers are commonly used.
Cold Laser vs. Traditional Laser Inscription:
Cold Laser: Low-energy, does not affect the diamond’s structural integrity, and is used for fine, precise engravings.
Traditional Laser: Higher energy, may cause heat damage, and is used for deeper engravings or larger designs.
How to Check for a Cold Laser Inscription:
To check for a cold laser inscription, you can examine the girdle of the diamond under a loupe or microscope. It will appear as tiny, precise text.
Alternatively, if you have the diamond’s certification or grading report from a lab like GIA, you can cross-reference the inscription with the report to ensure it matches the unique identifier of the diamond.