Opal Sheriff Programs
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At Opal Auctions we pride ourselves on only offering natural, earth mined Opals. We are able to do that by:

  • Creating our Verified Seller program which involves a rigorous process to become approved as a seller.

  • The creation of the Sheriff program that allows you to request an audit on an item. Continue below to learn more about this program.



The Opal Sheriff Program is a world first program that allows customers to request a review on any item listed on Opal Auctions. We are proud of this program and it has given customers peace of mind when buying opals online. Opal Auctions only allows natural Opals to be sold with no imitation or synthetics. The Opal Sheriff Program helps keep our high level of customer satisfaction by delivering exactly what we advertise.

It is operated by an independent panel of qualified Gemologists and advisers from within the Gemstone industry.

The panel will review and audit individual items at the request of customers and leave their findings on publicly visible reports on the item page.

The Sheriff has two main goals –

  1. To answer questions and guide potential buyers via the Audit system

  2. To support, mentor and guide our Verified Sellers.

Our Sheriff Program is offered across our entire network, giving you an extremely consistent experience and useful tool set on all our websites.

How To Use The Sheriff Program

Look out for “Audit Information” on the right hand side of all items. To request an audit simply click the button “Request Audit”

gemstone sheriff program

Once an audit has been requested the following message will be displayed until the audit is complete. “This auction has a Sheriff audit pending. Check back soon to see the completed audit.”

audit pending

Once the audit is complete the person who requested the audit will be notified via our internal messaging system. For everyone else the audit will be visible by clicking on the “View Report” button.

audit complete

The final report will specify two checks

  • Description Accurate - This is all of the details on the item including treatments.

  • Pictures Accurate - Pictures are accurate including enhancement

audit details

We aim to maintain a quick turnaround time, but it may take up to 48 hours for the audit to be written, therefore we recommend you request an audit early in an auctions` cycle and add the item to your Item Watch list to keep an eye on the audit status.

Now that you know how the Gemstone and Opal Sheriff program works go ahead and request a few. We are always here to help.

A Word On Opal

Some descriptive terms that everyone needs to be aware will no longer be acceptable for use without prior approval from the Opal Sheriff, including

  • Investment

  • Museum

  • Harlequin Pattern

  • Top Class

  • World Class

Any opal listed that has been treated most be described as treated

Ethiopian opal that is smoked cannot be called black opal but described as Smoked Opal.

No Ethiopian opal can be called black opal unless certified by an approved laboratory.

Black images Sellers can use black background image but have to have hand image and neutral image with each listing .

Regarding each term, in order to fit the criteria to be called worthy of the word ‘Investment’, sellers must be certain that what they have actually qualifies, but how can you ‘qualify’ something when the word ‘Investment’ is essentially meaningless?

Please read this short article by Don Clarke, President of the International Gem Society: Investing in Gems http://www.gemsociety.org/info/igem15.htm

We are adopting Mr Clarke’s guidelines, therefore use of the word ‘Investment’ will no longer be acceptable, and there are other words that are being used excessively to pump up auctions that are meaningless, such as World Class, Top Class or grade, and all are frowned upon because there is no standard for using them.

The same holds true for the word ‘Museum’, which is also meaningless since museums have just about every gemstone on earth in their archives, and all in varying qualities, so by what criteria would a stone be considered ‘Museum’ quality? There is none, so the word ‘Museum’ is also now unacceptable for use in auctions.

The word Harlequin, however, does have meaning, although the experts don’t always agree on what it means, but the consensus of opinion seems to be that the true harlequin pattern was so named because it resembles the costume of a harlequin, with its regularly arranged squares, of equal size, in a checker board pattern. This is why true Harlequins are extremely rare, since it is more common to see patterns with distorted angles, squares that are unevenly arranged, or squares that are too small to be called harlequin, and those patterns would be better designated as mosaic, honeycomb, flagstone. In ‘A Field Guide to Australian Opals’ (1977), Barrie O’Leary lists 12 subspecies of harlequin, and says the individual color patches in true harlequins should be set closely together, and be over one millimetre in diameter to qualify to be called ‘Harlequin’.

One thing everyone does agree on is that true harlequins are extremely rare; so rare that they consider themselves lucky if they get to see just one a year.

Based on that criteria, there are no photos of the Harlequin pattern on the chart, so if you have a photo of a true Harlequin we would appreciate you submitting it for the chart.

Rarity carries a lot of weight when it comes to value, so it can be very tempting to stretch the strict requirements of the definition of ‘Harlequin’ to fit many celled opal patterns, therefore, the use of the word ‘Harlequin’ now requires pre-approval by the OS Posse. So all our sellers need to go through their auctions and remove the words “Investment”, “Museum”, “World Class”, “Top Quality”, and all such derivatives from their titles and descriptions, as well as the word “Harlequin” until they get approval to use it from the Opal Sheriff. You can find a link to message us by looking for the Opal Sheriff Badge in the verified sellers list. This is effective immediately, so please clean up your auctions before the OS Posse finds these words being used, or someone reports you to the OS. Thank you for your time and cooperation, and for helping us keep our sites the #1 auction sites in the world, all because of our sellers’ reputation for professionalism, honesty and integrity. Keep up the good work. The OS Posse




保安官は2つの主な目標を持っています -

  1. 監査システムを介して質問に答え、見込み客を導く
  2. 確認済み売り手をサポートし、指導し、指導する







監査が完了したら、監査を依頼した人に、社内のメッセージングシステムを介して通知されます。それ以外のすべての人にとっては、監査は[View Report]ボタンをクリックすると表示されます。



  • 説明正確 - これは治療を含むアイテムの詳細の全てです。
  • 正確な写真 - 写真は補正を含めて正確です



Gemstone and Opal Sheriffプログラムがどのように機能するかがわかったので、いくつか要求します。私たちはいつも助けにここにいます。




  • 投資
  • 博物館
  • 道化師のパターン
  • トップクラス
  • ワールドクラス






国際宝石協会の会長、Don Clarke氏によるこの短い記事をお読みください宝石への投資http://www.gemsociety.org/info/igem15.htm



ハーレクインという言葉には意味がありますが、専門家はそれが何を意味するのかについて常に同意するわけではありませんが、ハーレクインの衣装に似ているので、本当のハーレクインパターンはそのように命名されたという意見のコンセンサスのようです。市松模様のパターンで、同じサイズの正方形が規則的に配置されています。これは真のハーレクインが極端にまれである理由です。歪んだ角度のパターン、不均一に配置された正方形、またはハーレクインと呼ぶには小さすぎる正方形を見るのが一般的であり、それらのパターンはモザイク、ハニカム、敷石。 'オーストラリアのオパールへの野戦ガイド'(1977)で、バリーO'Learyはハーレクインの12の亜種をリストして、本当のハーレクインの個々のカラーパッチは密接にセットされるべきであり、呼ばれる資格を得るために直径1ミリメートル以上であるべきハーレクイン。



価値があるとなると、希少性にはかなりの重みがあるため、 'Harlequin'の定義の厳密な要件を多くのセル型オパールパターンに合わせて拡張するのは非常に魅力的です。したがって、 'Harlequin'という単語の使用にはpreが必要です。 - OSによる承認。だから私たちのすべての売り手は彼らのオークションをたどり、彼らのタイトルと説明からの言葉「ハーレクイン」から「投資」、「美術館」、「世界クラス」、「最高品質」とそのようなすべての派生語を取り除く必要があります。彼らはオパール保安官からそれを使用するための承認を得るまで。確認済み売り手リストでOpal Sheriff Badgeを探すことにより、メッセージのリンクが見つかります。これはすぐに有効になるので、OS Posseがこれらの言葉が使われていることを発見するか、誰かがあなたにOSを報告する前にあなたのオークションを片付けてください。あなたの時間と協力、そして私たちのサイトが世界一のオークションサイトであることを手助けしてくれてありがとう。良い仕事を続けてください。 OSが持っている

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we want to know if a opal company is selling a piece of jewllery that that they have reduced how does the buyer know if they are getting a genuine reduction

23rd Jul 2020

thats great service !! tks so much

28th Jul 2019

Dear opal sheriff,

To change the feedback I entered in the past, Is it possible? 
If possible, please let me know how.
I would like to change my feedback on Bravoopal Store's item 769930 from neutral to positive.

Gaku Takahashi

5th May 2019

The sheriff service is free?

20th Mar 2019

I have a set of cufflinks that were made by my grandfather mr alf tyack in 1975. He told me that they are black opal. I was 16 years old when he gave them to me and he said dont lose them as they will be worth a few dollars. How do i get them authenticated

20th Aug 2017

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