Opal Discovery #2
Have you ever wanted to know how to judge an opal’s quality? In part two of Giulians’ opal discovery, lets take a look at the different qualities that make a great opal.
In a previous post, I hinted that there are many factors that go into determining a quality natural Australian opal. However, it is important to remember that the best way to judge the beauty of an opal is by choosing the one that speaks to you! It is easy to get distracted by the jargon and what is considered more valuable or rare, but personal taste and preference is still the most important thing to consider. Each opal is millions of years in the making and a little piece of Australian history and they are all one-of-a-kind!
If you are interested to know what makes the difference between a good opal and an amazing opal – read on!
Qualities of Australian Opal
The colour you see is an important factor in an opals value, but it is not the only consideration. The colour red is the rarest to be found, and rarity does tend to increase value. But amazing quality opal in any colour is rare – so even a super bright blue-green opal will be considered valuable – perhaps more so than an opal that shows only red and no other colours. A gem exhibiting all five colours – blue, green, yellow, orange and red is very rare and desirable.
Colour coverage and colour direction
The percentage of an opal that is covered by colour will affect the value. If an opal has 50% of the stone showing bright play-of-colour, and the other 50% showing darkness or minimal colour, this opal will be valued lower than an opal with 100% of its surface covered by bright colour. The direction the colours are seen will also affect the value of a gem, as some opals will show a bright flash in one direction, and then darkenss in another. This opal would be considered perfect for a pendant, as they are generally only worn in one direction, and we would set it in the direction of it’s brightest colour.
One surprising factor of an opal’s appearance is the body tone. Body tone refers to the general colour of the opal, ignoring the play-of-colour. This is by looking at the common opal or ‘potch’, which is the greyish – black material that is seen on the back of a black opal, and the greyish white that is behind some white opals. You may hear some references to a body tone colour chart, like in the image below, but at Giulians we prefer the terms Black (N1-N4), Semi-Black (N5-N6), Light (N7-N8), White (N9) and crystal. The darker the body tone, the more contrast and intensity of the play-of-colour will be seen, increasing the value.
Transparency, Clarity, and Brightness
One of Gary’s favourite analogies for judging clarity in opal is by comparing it to analogue versus digital photography. Holiday snaps that were taken hastily on film and developed, would often have a grainy or slightly cloudy appearance, in comparison to the crisp clarity of the digital photography of today. Some opals will have a certain clarity of colour, and crispness that just makes the colours pop.
The pattern in opals can affect the value, as some patterns are more rare than others. There are many names given to the patterns seen in opal, and I have listed a few of the more famous ones below.
Chinese writing – This pattern has very linear and crisscrossing colour patches that resemble the look of Chinese characters.
Rolling flash – A bright flash that travels across the opal while it is being moved.
Ribbon pattern – This pattern is reminiscent of the texture of satin ribbon, where bands of colour run parallel to each other.
Straw – Straw pattern is characterised by small but linear patches of colour in a mix of intersecting directions.
Pinfire – As the name may suggest, pinfire patern is made up of tiny pinpoint colour patches, resulting in an overall glittery effect.
Harlequin – this is the rarest pattern in opal. Giulians have had some stunning examples of this pattern in the past, like the black opal in the image below.
I hope you have enjoyed reading about some of the qualities that make an Australian opal so unique. If you would like to know more about our opals, or any of our opal pieces please get in touch at firstname.lastname@example.org or by filling out the below form.
Thanks for reading!
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Best Restaurants in Sydney
Visiting Sydney soon? A little over a month ago the Good Food Guide announced it’s list of hatted restaurants for 2019, so if food is your thing, read on!
The Australian Good Food Guide Chef Hat’s are Australia’s equivalent to Michelin Stars and have been awarded since 1982. Taste, ingredients, presentation, technique, value, and consistency are all taken into account by the anonymous AGFG Inspectors, who give a score out of 20.
It is a huge honour for a restaurant to receive one hat – and absolutely spectacular to be awarded two or three. Please read on to discover the best Sydney restaurants according to the Australian Good Food Guide.
3 HATS – SYDNEY (3)
NSW: Momofuku Seiobo, Quay, Sixpenny
2 HATS – SYDNEY (25)
Aria, Automata, Bennelong, Bentley Restaurant and Bar, Bert’s Bar and Brasserie, The Bridge Room, Cirrus, Ester Restaurant, Est., Firedoor, Fred’s, Icebergs Dining Room and Bar, Lucio’s, LuMi Dining, Monopole, Mr Wong, Ormeggio at The Spit, Oscillate Wildly, Pilu at Freshwater, Porteno, Restaurant Hubert, Rockpool Bar and Grill, Saint Peter, Tetsuya’s, Yellow
1 HAT – SYDNEY (50)
10 William St, A1 Canteen, Acme, The Apollo, Bacco Osteria, The Bathers’ Pavilion, Billy Kwong, Bistro Guillaume, Ble Restaurant, The Boathouse on Blackwattle Bay, Bodega, Buon Ricordo, Catalina, Chin Chin, China Doll, Cho Cho San, Continental Deli Bar Bistro, Cottage Point Inn, The Dolphin Hotel, Felix, Fratelli Paradiso, The Gantry, Glass Brasserie, Hartsyard, Hotel Centennial, Izakaya Fujiyama, Jonah’s, Kepos and Co, Kepos Street Kitchen, Lankan Filling Station, LP’s Quality Meats, Nomad, Otto Ristorante, Paper Bird, Poly, Queen Chow, The Restaurant Pendolino, Rising Sun Workshop, Rosetta Ristorante, Sagra, Sake Restaurant and Bar (Double Bay), Sean’s Panorama, Sokyo, Sotto Sopra, Spice Temple, Stanbuli, Sushi e, Three Blue Ducks (Bronte), Uccello, Yan
Full list of all Australia’s hatted restaurants click here
Full list of award winners click here
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