How to select coloured diamonds

How to select coloured diamonds
How to select coloured diamonds……

Nina’s can help make this simple for you. Call us at anytime and ask for help, the phone is often the best way
- Dunsborough +61-8-9759-1366
- Kununurra +61-8-9168-2646
Alternatively use our live chat, through the website, our senior team in the stores, and after hours are available to chat. If not we will get back to you as soon as possible.

Decision points

  • What is the reason for the purchase? Investment (often a loose stone), engagement, dress ring….
  • Decide on a 'ball park' budget. Does your budget include a setting? Coloured diamonds can be purchased on almost any budget, don’t be discouraged.
  • Learn as much as you can.
  • Only ever buy naturally coloured diamonds.
  • Make sure you can see a 360 image of the stone or the piece of jewellery when buying online.
  • Try to buy jewellery that is 18K gold at least, it is far more resilient and can last twice as long as 9K gold.

Pick a colour

In order of, roughly, the most to least expensive at the moment 2018.


If purchasing pink stones for investment only buy diamonds with certificates or lot numbers that give you Argyle provenance. If it seems too good to be true, it’s too good to be true.
Deeper colours give the best investment return and jewellery impact, of course they are the most expensive. Except black and champagne.
Colours are classified by Gemmological Institute of America as

Colour colour colour

Find the largest, best colour stone in your budget.

Sacrifice clarity for colour and size. Big black spots in the middle of a stone present very poor clarity and consequently less sparkle.
Perfection of cut is not as influential for coloured stone, the way it is for white stones. Often coloured stones are cut to enhance the colour, so symmetry and proportions are sacrificed for size and colour.

In almost all circumstances deeper colour is more valuable

Champagne stones are classified by the GIA as brown and the secondary hue is orange, green, yellow sometimes red, blue or even pink. It is up to personal choice.
Black stones are often heat treated with very poor clarity, they can be very inexpensive. Nina’s would not recommend these for investment purposes.

Purchase colour that is even.

There can be confusion when comparing Argyle classifications to GIA classifictions. The Argyle classification for pink diamonds has the strongest colour: 1P in pink, 1PP purplish pink and 1PR pink rosé and 1Y for yellow stones. The champagne stones were classified on the opposite scale with the darkest stones C7 and the lightest stones C1.

This is roughly how the GIA stones relate to the GIA classifications.

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