Blue sapphire is one of the most popular and valuable gemstones in the world. It is known for its deep blue color, durability, and rarity. However, like all gemstones, sapphires can have flaws. One common issue is cracking. A cracked blue sapphire can affect its beauty, value, and durability.
In this article, we will discuss what causes cracks in blue sapphire, the different types of cracks, how they affect value and durability, how to identify a cracked sapphire, whether cracked sapphires can be repaired, whether you should buy one, and tips for caring for a cracked sapphire.
This guide will help you understand cracked blue sapphires so you can make an informed decision when buying or selling one.
What Causes Cracks in Blue Sapphire?
Cracks in blue sapphire can happen for many reasons. Some cracks form naturally, while others occur due to human handling.
Natural formation is one cause. Sapphires form deep underground under high pressure and heat. During this process, tiny cracks, called inclusions, can develop inside the stone. These are common and may not always weaken the gem.
Heat treatment is another cause. Most blue sapphires are heat-treated to improve color and clarity. High temperatures can sometimes cause stress inside the stone, leading to cracks.
Rough handling during cutting can also cause cracks. Sapphires are very hard, but they can still crack if cut too aggressively. A sudden impact or pressure during cutting can cause fractures.
Accidental damage is another factor. Even though sapphires are durable, a hard knock or drop can cause cracks, especially if the stone already has internal weaknesses.
Extreme temperature changes can also lead to cracking. Sudden temperature changes, like moving from hot to cold quickly, can make a sapphire expand or contract, leading to cracks.
Types of Cracks in Blue Sapphire
Not all cracks are the same. Some are minor, while others can ruin the stone.
Surface cracks are small cracks on the surface. They may not go deep into the stone and can sometimes be polished away.
Internal fractures are thin, wispy cracks inside the gem. They can look like feathers under magnification and may weaken the stone if large.
Chip cracks are small pieces missing from the edges or facets. They are often caused by impact damage and can sometimes be recut to remove the chip.
Deep cracks are large cracks that go through the stone. They can split the sapphire if hit again and greatly reduce value and durability.
How Cracks Affect a Blue Sapphire’s Value
Cracks can lower a sapphire’s price, but not always.
Minor cracks may not hurt value much. Small internal feathers or surface cracks may be acceptable if the color and clarity are excellent. Buyers may still pay a good price for such stones.
Visible cracks lower the value. If cracks are visible to the naked eye, the price drops because buyers prefer eye-clean stones with no visible flaws.
Deep or large cracks significantly lower value. They pose a risk of the stone breaking further and are hard to sell unless priced very low.
Cracks in rare sapphires are judged case-by-case. Kashmir or Burmese sapphires with cracks may still sell for high prices due to rarity. Buyers may accept flaws for exceptional color.
How to Identify a Cracked Blue Sapphire
Before buying a sapphire, check for cracks.
Using a jeweler’s loupe is the best method. Look inside the stone for feather-like lines under 10x magnification. Surface cracks may reflect light differently.
Examining the stone under bright light helps. Turn the sapphire under a lamp, and cracks may appear as shiny lines or dark streaks.
Checking for chips on the edges is important. Run your finger along the girdle of the stone. Chips feel rough or uneven.
Asking for a gemstone report is wise. Labs like GIA or AGL can detect cracks, and a report will confirm if cracks are present.
Can a Cracked Blue Sapphire Be Repaired?
Some cracks can be fixed, but not all.
Recutting the sapphire is an option if the crack is near the surface. A jeweler can recut the stone to remove it, though this reduces the carat weight.
Fracture filling is possible but not recommended for high-quality sapphires. A resin or glass-like substance fills the crack, improving appearance temporarily. Heat can melt the filling.
Leaving it as-is may be best if the crack is stable. Small internal cracks may not need repair, but avoid further impacts.
Avoiding heat or ultrasonic cleaners is crucial, as these can worsen existing cracks.
Should You Buy a Cracked Blue Sapphire?
It depends on your purpose.
There are good reasons to buy a cracked sapphire. They are budget-friendly, as cracked sapphires cost much less. They can be set in jewelry with protective settings like bezels that hide edge chips. Collectors of rare colors may accept some cracks in exceptional stones.
However, there are times to avoid a cracked sapphire. They are not ideal for engagement rings or daily wear due to the risk of further damage. If the crack is too visible, it affects beauty. They are also harder to resell.
How to Care for a Cracked Blue Sapphire
If you own a cracked sapphire, handle it carefully.
Avoid hard impacts by removing jewelry before sports or heavy work.
Clean gently with mild soap and water, avoiding ultrasonic cleaners.
Store separately from harder gems like diamonds that could scratch it.
Have regular check-ups with a jeweler to inspect for crack growth.
Conclusion
A cracked blue sapphire can still be beautiful, but buyers must understand the risks. Small cracks may not be a problem, but deep fractures can weaken the stone. Always inspect a sapphire carefully before buying and ask for a lab report if unsure.
If you own a cracked sapphire, handle it with care to prevent further damage. While some cracks can be fixed, others are permanent. Knowing the difference will help you make the best decision for your jewelry collection.
Would you buy a cracked sapphire? Let us know your thoughts!
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