Opals are known for their enchanting play-of-colour, making them one of the most unique gemstones. To understand what makes an opal valuable, it is important to look at several factors, such as its colour, clarity, and craftsmanship.
1. Play-of-Colour
Play-of-colour is the most important feature of an opal. It creates the stunning mix of colours that sets opals apart from other gemstones.
(High-Quality Play-of-Colour)
First, the brightness of the play-of-colour matters. Bright colours are easier to notice and make the opal look more vivid and valuable. On the other hand, if the colours are faint or dull, the opal’s value will be lower.
Next, the pattern of the colours is important. Patterns that are rare or visually striking, like harlequin or floral shapes, make the opal more desirable.
Finally, the number of colours in the play-of-colour also adds to the value. Opals that show many colours are worth more than those with only one or two.
2. Body Colour
After considering the play-of-colour, the body colour of the opal is the next key factor. The body colour acts as the background and affects how the colours are displayed.
(Low-Quality Play-of-Colour)
(Brilliant Play-of-Colour)
For instance, black opals are the most valuable because the dark background makes the colours look brighter. In contrast, white opals are less valuable because their light background softens the colours and makes them harder to see. Opals with body colours like yellow, red, or green are even less valuable because they provide less contrast with the play-of-colour.
3. Clarity
The clarity of an opal shows how clean and flawless it is. Opals with no visible imperfections, such as cracks or inclusions, are worth more. When flaws like sand spots or cracks are present, they can lower the opal’s value because they affect its beauty and durability.
4. Cut
The way an opal is cut also makes a big difference. A well-cut opal looks more beautiful and is easier to wear.
A good cut should highlight the play-of-colour and make the opal look balanced and smooth. For example, cabochon cuts with even, rounded domes are preferred because they show off the colours better. On the other hand, uneven cuts or rough surfaces can make the opal less attractive.
Polishing also plays a role. A well-polished opal reflects light smoothly, while poor polishing can leave scratches that reduce its appeal.
5. Carat Weight
Finally, the size of the opal affects its value. Larger opals are rarer and more valuable, but size alone is not enough. The opal’s quality in terms of colour, clarity, and cut must also be considered to determine its true worth.
