Heating is an accepted treatment for sapphire. But for fine-quality sapphire, confirmation from an independent laboratory like GIA that there is no evidence of heat adds to a sapphire’s rarity and value.
Is a heat treated sapphires bad?
Once considered completely useless, this corundum (sapphire) has been treated in a sophisticated heating process that radically changes the color and clarity so that it becomes a mix of pink sapphires and rubies. These stones are now considered of saleable quality.
What percentage of sapphires are heat treated?
If a gemstone has been heat treated, it simply means it has undergone some type of thermal process in order to alter or improve its appearance. In this modern era, nearly 95 percent of sapphire gemstones are heat-treated for several important reasons.
Does it matter if a sapphire is heated?
Most people are unaware that almost all sapphires are heated at extremely high temperatures to “enhance” their color and clarity. A sapphire can be listed as “natural” simply because it is not lab created. … However, “natural” does not mean the sapphire has not undergone any alterations.
Why are heated sapphires bad?
When Heating Affects Value Negatively.
In some instances, a sapphire could gain a “new” inclusion after heating; it could also heat to an undesirable or less valuable color. Choosing the right sapphires and the appropriate heating process takes many years, often times decades, of experience to become great at it.
What are blue sapphires worth?
Sapphires can come as cheap as $25 per carat, to over $11,000 per carat. A blue sapphire around 1 carat is likely to cost from as little as $450 to $1,600, depending on quality.
Can you heat treat sapphires at home?
The easiest way to improve clarity and color of low-grade sapphires is to mimic the natural process and apply heat via an oven or furnace. Heating a sapphire at high temperatures specifically dissolves inclusions known as “silk” and other impurities, making the gemstone more valuable.
How do you know if a sapphire is good quality?
You want to look for a sapphire that has no inclusions visible to the naked eye. experts look at the size, location and number of inclusions to judge clarity. The less visible the inclusions are, the higher the grade. Cut: The cut is essentially what makes a sapphire really sparkle.
Are diffused sapphires worth anything?
The price between each level of treatment can range from. The exceptionally expensive US$5,000 per carat for unheated natural sapphires. To US$1 per carat for the new treatment lattice-diffused sapphires which has now flooded the market today. This is especially true with many dealers on eBay especially in Thailand.
What does no heat Sapphire mean?
Untreated sapphires means those that have not had any form of treatment to enhance their colour or clarity. … Unheated sapphires mean the sapphire is natural and it has not been enhanced by any form of heat treatment or any other treatment.
Which gemstones are not treated?
Untreated Orange, Brown, and Rose Zircon Gemstones
While the popular blue zircon is heat treated, there are natural zircon gems that are not treated in any way. These include brown, rose, rose-orange and golden orange zircon gemstones.
Why are some sapphires cheap?
The price of a sapphire is determined based on its quality, which means that a large, low-quality sapphire would be a lot cheaper than a small but very high-quality sapphire. Blue sapphires usually have some inclusions, but generally have better clarity than rubies.
What is the difference between heated and unheated sapphires?
The color of a heat-treated sapphire will remain permanent and will not change or fade unless the stone undergoes a secondary treatment. … Some jewelry houses still prefer to offer only natural, unheated sapphires, but they would happily use a heated sapphire if it was requested by their client.
Are dark sapphires more valuable?
Color has the greatest influence on a sapphire’s value, and preferred sapphires have strong to vivid color saturation. … Sapphires with these qualities command the highest prices per carat. Less valuable blue sapphires might also be grayish, too light, or too dark.
Do sapphires fade?
The only colors of sapphires that are known to have a fading color property are yellow and padparadscha sapphires. … They exhibit this unique color fading and reviving characteristic as a feature of the stone’s natural design.