The Truth About Opals: Why Some Are Worth Thousands

Opals have always had a bit of mystery around them. One look at that shifting rainbow of colors and it is easy to see why people fall in love with this gemstone. But here is the thing most buyers do not realize: not all opals are the same. Some are worth a few hundred pounds, while others can sell for tens of thousands.
If you are thinking about buying an opal, or just curious why they vary so much in price, this guide will break it down in plain English.

Not every opal has that rainbow sparkle.

• Precious opal: Shows play of color
• Common opal: No color play, just a solid color

Common opals can still be beautiful, especially in soft pastel shades like pink, blue, or green. They are simply less rare and more affordable.

Opals are softer than gemstones like diamonds or sapphires. They sit around 5.5 to 6.5 on the Mohs hardness scale.

That does not mean they are too delicate to wear. High quality opals can still be used in rings, earrings, and pendants if set properly.

Tips for durability:

• Choose thicker stones rather than thin slices
• Use protective settings like bezels
• Avoid rough daily wear if possible

1. Black Opal – The Most Valuable

Black opals are the rarest and most expensive type. They usually come from Australia and have a dark body tone that makes the colors appear more vibrant.

Why they are expensive:

• Strong contrast makes colors pop
• Rare patterns like harlequin or large flashes
• Red and orange colors increase value dramatically

Typical price range:

• £1,500 to £6,000 for good quality stones
• £10,000+ for collector pieces

2. White Opal – Soft and Affordable

White opals have a light background, so their colors appear more subtle and pastel.

They are a great choice for everyday jewellery.

Typical price range:

• £400 to £1,000 depending on size and color

Tip: Australian white opals are generally more stable than Ethiopian ones, which can change color over time.

3. Boulder Opal – Bold and Unique

Boulder opals form within ironstone, which stays attached to the gem. This creates a natural backing and adds durability.

Why people love them:

• Larger sizes available
• Unique patterns
• More affordable for the size

Typical price range:

• £100 to £4,000 depending on quality

4. Matrix Opal – A Natural Pattern Look

Matrix opals contain tiny specks of opal scattered through the host rock. They often look like abstract art or natural landscapes.

Typical price range:

• £100 to £300

5. Fire Opal – Bright and Fiery

Fire opals are known for their orange, yellow, or red body color. Some have play of color, but many do not.

They are usually transparent or translucent and have a warm glow.

Typical price range:

• Similar to white opals, around £800 to £1,500 for larger stones

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6. Common Opal – Simple but Beautiful

These do not show rainbow colors but come in lovely shades like:

• Blue
• Pink
• Turquoise green

They are often used in fashion jewellery.

Several factors affect how much an opal is worth:

Color

• Red and orange increase value
• Blue and green are more common

Pattern

• Large, bold flashes are more valuable than tiny specks
• Rare patterns like harlequin can command high prices

Brightness

• The more intense the color, the higher the price

Size and Thickness

• Thicker stones are more durable and valuable
• Very thin opals are prone to damage

Origin

• Australian opals are often considered more stable

Ethiopian opals can change over time if not properly aged