The ‘Third C’

The term ‘cut’ is often confused with the shape* of the diamond (such as round, princess, pear-shape). However, in diamond grading the ‘cut’ refers to the craftsmanship of the diamantaire: the ability to unlock the beauty within a rough crystal by polishing individual, precise facets.

Ideally an artisan cuts a diamond to make the best use of light. When a diamond is cut to perfect proportions, light is refracted inside the stone, reflected from one facet to another, and then dispersed through the top of the stone. Extensive study of the laws of physics has allowed us to theorise and observe a range of proportions that achieve the maximum return of light.

If a diamond is cut too deeply, some light escapes through the opposite side. If too shallow, light escapes through the bottom of the stone before it can be reflected back to the viewer.

In order to maximise the ‘yield’ of any particular diamond crystal, a cutter may be tempted to depart from the range of ideal proportions.

For an explanation of the way light behaves within a diamond, click here to see an article from our June 2004 Newsletter.

35704 June 2003 Newsletter

35704 June 2003 NewsletterPeople often comment that our diamonds “sparkle” more. This is due to our determination to choose the best cuts from parcels. The illustration here, of a tray of perfectly cut diamonds, contrasts with a tray of poorly cut stones. Which would you prefer to wear?


Abrecht Bird Jewellers | Quality handmade jewellery

Level 2, 227 Collins Street, Melbourne | Ph: (03) 9650 3830 | Email:

© Abrecht Bird Jewellers 2014 | This site designed by Altitude Unlimited | Admin