What does heat treatment do to sapphires?

Is a heat treated sapphires bad?

Heat treatment alone does not affect the durability of sapphires. It is important to be aware that fracture filled or doublet sapphires can be problematic in future as they are less durable.

Are Tiffany sapphires heat treated?

Tiffany selects only the finest gemstones from around the world. Our gemstones are inspected for quality, beauty and durability, and only the stones that meet our exacting standards for color, clarity and cut are deemed Tiffany quality. … HEATING The use of heat to alter the color and/or clarity of a gemstone.

Whats the difference between heated and unheated sapphire?

The gem will have the same stability and durability as an unheated sapphire, and the price point will actually tend to be lower for a heat treated sapphire than for a natural, unheated gem. On the other hand, there are some forms of heat treatment that cannot be said to be as durable and are therefore not as popular.

What is an untreated sapphire?

In very short detail, an untreated sapphire is one that has been taken from the ground and then faceted. Nothing at all was done to the stone to alter the natural beauty, which only elements and process in the earth created naturally. These sapphires are exceptionally more rare and valuable.

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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.

What month is pink sapphire?

September | Sapphire

Sapphire, the birthstone of September, is most desired in its pure, rich blue color but is present in almost every color including pink, yellow and green.

Is pink sapphire more expensive than blue?

The sapphire is typically known as a blue gemstone. However, in general, they are far less expensive than pink diamonds, although prices for the pink sapphire do tend to fluctuate depending on the color, carat, and cut. …

Which color sapphire is the most expensive?

In terms of color, pure blue sapphires are the most highly prized, and therefore tend to be the most expensive. This is one of the qualities of the Kashmir sapphire, said to be like “blue velvet” in their appearance.

How can you tell if a gem is heat treated?

Heat treatment is a very risky process as many gems have inclusions that expand at a different rate and cause stress fractures, which then becomes an identifying characteristic of heated gems, particularly sapphire and ruby which can display halos around inclusions within the gem.

Are unheated sapphires worth more?

Are natural, no-heat sapphires more rare and valuable? Yes, sapphires that have not undergone any color or clarity enhancement along the supply chain (mine to retail) are rare and therefore more valuable than heated sapphires that are abundant in the market. Are all unheated sapphires the same? No.

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Are heat treated sapphires less valuable?

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.

Are untreated sapphires rare?

The key term is “untreated,” meaning a sapphire is natural (not lab created) and has not been subject to any chemical or heat treatments. Approximately only 0.5 – 1% of the sapphires discovered are of gem quality without treatment.

What is the natural color of a sapphire?

Sapphire is generally known as a blue gemstone but surprisingly it comes in a wide range of colors and quality variations. In general, the more intense and uniform the color is, the more valuable the stone. Sapphires that are not blue are known as fancy sapphires, and may be any color—except red (which is a ruby).