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Example - If you have a model 44 Rear Axle with a 3.54 ratio and wish to change to a 3.73 ratio, you change only the ring gear and pinion assembly. If you change the ratio to a 4.09, you must change to a high-ratio case in addition to changing the ring gear and pinion. The application section will show you what case to use.

What is a GIA laser inscription?

Diamonds accompanied by GIA Diamond Dossiers® typically feature a micro-laser inscription applied to the edge of the diamond. The GIA report number appears microscopically engraved on the outer girdle of the diamond. The laser inscription gives buyers a unique way of linking their GIA report to the diamond itself. Enter this number into GIA’s website and hey-presto – you have an electronic copy of your diamond grading report.

Where to find the girdle of a diamond

The girdle of your diamond runs around the outer edge between the upper crown facets and the lower pavilion facets. It is the thin outer edge, separating the upper part of the diamond from the lower section. The polished, faceted or bruited (matt) girdle includes the number applied microscopically.

A GIA laser inscription gives the consumer greater confidence when purchasing a diamond. Retailers should use this as a further selling point since not all laboratories laser mark diamonds in this way. GIA records the stone under this number in their online archive.

The GIA inscription is invisible to the naked eye and difficult to see under 10x magnification to the untrained eye. Buyers who purchase without consultation are likely to be unaware of the presence of the inscription.

BRAND NEW SERVICE!!We now offer the option to have customised wording lasered on the girdle of your diamond. Please inquire for more information on this bespoke service. Please note this service is only available on diamonds sourced via Serendipity Diamonds.


Ahead of choosing the ring design, we can provide any GIA certified diamond housed within a ring clip and presented in the same way as an engagement ring.

Why is the GIA laser inscription useful?

Diamond merchants, jewellery retailers and manufacturers handle a large volume of certified diamonds weighing below 1 carat.

Retailers often source selections of similar diamonds to show before a sale. These diamonds often vary so slightly that they appear identical to the inexperienced eye. Similar diamonds can muddled, so, having a system for checking diamonds back into their parcels is extremely important.

Example. When a retailer shows three diamonds – all 0.50cts in weight – graded D colour VS1 clarity, E colour VVS2 clarity and D colour VVS1 clarity, the GIA inscription allows accurate identification of each diamond. Near identical diamonds are less likely to be confused or mixed-up.

The problem with GIA laser inscriptions

We have already touched upon the microscopic size of the laser inscription. Tiny numbers pose a problem for many people who don’t have the knack or trained eye while using a 10x loupe. Manufacturers, retailers and consumers need to be able to view their inscription, but the size makes this an arduous task. The inscription size needs to be microscopic to fit discreetly onto the girdle and to ensure the beauty of the diamond is unaffected.

What is the best magnification to view a diamond inscription?

Based on the magnification of the viewer we sell (see below), the magnification is 20x. It will always take a little time for set-up to view the inscription but provided the number is not too faint, it should be visible at this magnification. For most people, a standard diamond loupe (10x) will struggle to provide enough magnification to read the full number.

Useful tools for viewing the GIA laser inscription

A recent review of the GIA inscription reader emailed to us from our client in the US

If you would like to make viewing more manageable, we would recommend the Laser inscription viewer. This handy well-constructed device works with a diamond held within a ring mount or ring clip. An adjustable magnifying glass rests at the end of an arm which glides effortlessly around the outer edge of the diamond allowing the user to scan for the GIA inscription. Once found, adjust the lens for a clear view of the GIA number. It will take the user a little time to become acquainted with the viewer, but by using this instrument, the inscription will be readable.

As a bonus, the viewer includes a hearts & arrows viewer for loose diamonds concealed within the body of the scope. (Shown here alongside the inscription viewer.)

Digital Microscopes for reading GIA inscriptions

Gemmological microscopes tend to be expensive. Furthermore, they are overkill in this situation unless you are a professional jeweller. We looked around to see if there were any new devices around the £20 – £30 mark that might be suitable. The following seemed very good for the price, and convenient because it connects to a smartphone.

This affordable microscope connects to a smartphone and could provide a way to capture the inscription image.

Advice for purchasing with a GIA laser inscription

If you buy a GIA certified, laser inscribed diamond, consider the following information.

1. In-store – ensure that your retailer has a viewer so that you can see this critical feature of the diamond. Many buyers do not require this level of detail, but some clients enjoy the reassurance of seeing their inscription.

2. If you decide upon a GIA certified diamond engagement ring with laser inscription, speak to your jeweller about positioning the diamond so that the number remains visible when the diamond has goes into the ring.

On a final note, if you are looking for a specific GIA certified diamond, we feature an extensive catalogue of GIA certified diamonds on our website as part of our loose diamond service. Some even feature traceability back to the mine of origin. (See our GIA CanadaMark range or contact about traceable diamonds or for help on sourcing the perfect stone.)

Other types of serial numbers appearing on certified diamonds

GIA inscriptions are not the only number found on a diamond. Additional serial numbers accompany different types of diamond. At Serendipity, we specialise in being able to supply diamonds that are traceable back to the very mine from where they originated.

View available diamonds and get GIA report copies and video in just two clicks. Contact us with your choice of stone you wish to purchase.

CanadaMark Inscriptions on diamonds

The following image shows the “Canadamark” serial number that accompanies the diamond from rough to polished stone. Look closely, and you can also see the GIA number reflected from the opposite girdle. Contact us if you would like us to source a diamond with traceability back to the mine. Please note that all of our CanadaMark diamonds include the laser inscribed GIA number and CanadaMark number.

Please ask us about fully traceable CanadaMark diamonds available at Serendipity Diamonds.

Inscriptions on Lab-grown diamonds

Lab-grown diamonds and natural diamonds look identical, even to a trained eye. For this reason, human-made diamonds feature a laser inscription on the rock to this effect. Viewed through our inscription reader, the diamond certificate number and reference to lab-grown appear on the edge of the stone.

We photographed the following diamond to show the inscription.

Please contact us if you require any help sourcing a lab-grown diamond available upon request.

About Mark Johnson

Mark attended Liverpool University and went on to pursue a career in the diamond industry. After more than a decade working in polished diamonds, Mark moved to the Isle of Wight where he launched Serendipity Diamonds. He works most days from their busy Ryde showroom, photographing jewellery and writing for the Serendipity Diamonds website.

I apologize because I'm sure this has been asked a lot.

I'm confused as to how to date this gun. I used to know a lot about guns and hunted all the time with my father, he fell ill some five years ago and passed away, before then he just randomly gave me this gun and gave the rest of them to my stupid brother I guess he figured the 1100 would be a good gurly gun and I used to shoot skeet with my little gurly 410.
What I know it's a 12 gauge, 2 3/4 with a full ribbed barrel. I'm unsure as to how you get the exact length of the barrel. If I pull it out it measures at 33in.

Search Ring By Serial Number Idm

What I'd like to know is how old it is. I know my father purchased it before 1980.

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The receiver has the serial 491**V, I understand V to mean 12 gauge. There aren't any prefix codes to the serial.

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The barrel has the code AFKI or AFK1, I'm unsure as the stamping is messy.

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If no one can help me that's fine, as soon as I register it I can take it to a gunsmith, there's a little broken clip that causes it to jam if you attempt to eject a shell. Because of this I've been holding onto it for the past 6 years and haven't tried shooting it as I'd be concerned it was unsafe but now my daughter is too big for the 410 and wants to shoot something bigger. As I remember this was a nice ladies gun with a minimal kick but it's been over 20 years since I shot it at the local turkey shoot, still don't need any turkeys.
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