You asked: What does it mean when a gem is heat treated?

Heat Treatment is a gemstone’s exposure to high temperatures that alters the color and increases the clarity. Specifically, heating is used to lighten, darken or enrich the color. Without heat treated gemstones, fine gems’ availability in the most desirable colors would be scarce.

Are heat treated gems less valuable?

Heat treatment is the most common treatment and without heat treatment the availability of fine gems would be significantly less. With less gems prices would be dramatically higher only available to the rich. This is the reason untreated gems often command 30% to 50% higher prices.

Are heated gemstones bad?

Durability: Since most gem crystals were formed under high temperatures, when it comes to wearability and durability heating usually does not have a negative effect on a gemstone. Also, the color stability (resistance to fading or color changing) of heated gems is usually very good and they are super stable.

What is the difference between a heated and unheated gemstone?

The gemstones are subjected to a very high temperature between 500 and 1800 degrees Celsius which changes their colour altogether. It improves both, clarity and colour.

Difference between Heated and Unheated Gemstones.

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Heated Gemstones Unheated Gemstones
Inclusions No inclusions or they are formed after heating Has natural inclusions

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.

What does heat treatment do to sapphires?

The oldest and most common sapphire enhancement is heat treatment, and the majority of the sapphires in the marketplace have been heat-treated or thermally enhanced in furnaces. Heat treatment is used to improve a sapphire’s color, remove color zoning , and improve clarity.

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 does heat treated Emerald mean?

Unlike Rubies and Sapphires, Emeralds are never exposed to heat treatment to enhance color or clarity. … The purpose of this is to draw the filling substance into any surface-reaching fissures (on a microscopic level) to improve the clarity of the Emerald.

What does it mean if a ruby is heat treated?

Heat treatment is used to either develop or intensify a ruby’s natural color. Heat treatment can also improve the clarity of a ruby by removing or reducing inclusions and making them less visible. The way this works is quite technical.

What does no heat GEM mean?

Unheated sapphires mean the sapphire is natural and it has not been enhanced by any form of heat treatment or any other treatment.

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How do you tell if a stone is heat treated?

The destruction of gas or fluid inclusions or the dissolving of mineral inclusions are clues to heat treatment. For gems that contain rutile needles, the needle margins may become diffuse. On rubies, inclusions may be found that are glassy in appearance.

How can you tell if a sapphire is heat treated?

Ways of Detecting “Normal Heat” Treatment Sapphires are by Seeing the Following Inclusions:

  1. Discoid fractures with tension halos. …
  2. Burned or altered mineral inclusions. …
  3. Broken silk or partially “reabsorbed” rutile needles.
  4. Ruptured two-phase inclusions and negative crystals.

Are heated rubies valuable?

You should assume your ruby is heated. Rubies that have a report from an independent laboratory like GIA confirming there is no evidence of heat command a premium due to their rarity. Rubies that have been diffused or are glass filled are worth less than heated rubies.

What is the difference between treated and untreated gemstones?

More than 80% of the gemstones currently being traded in the market are either enhanced or treated in one form or another. … Untreated gemstones are those that are not altered or enhanced in any way. They remain in the same form as when they were extracted from the earth.

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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What does untreated sapphire mean?

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.