When buying jewelry, you will always hear No indication of thermal treatment, Heated, H(Heated),H(a)(b)(c)(d)(Be) , many friends do not understand what it means.Today, let’s talk about it for you~~

💎 No indication of thermal treatment

It means that the stones are natural and have not been artificially heated. They have been naturally heated for a long time underground, so without artificial heating, the stones are already beautiful! It’s a natural gem in the true sense. Gemstones with No indication of thermal treatment have a higher standard of color, clarity and stability than roasted gemstones. Because of this, they are more precious and rare.

💎Heated

Heated means that through heating and treatment, some impurities or parts of the uneven color in the gem will be burned or changed, and the transparency will be changed, so that the color of the whole gem is more uniform and bright. Sometimes natural gems and us humans, there are always some skin problems, heating treatment can be said to make up the gems, make them more beautiful. Generally speaking, Gemstones with No indication of thermal treatment is more expensive than with heated, and much more expensive! Heated is divided into H(Heated) and H(a)(b)(c)(d)(Be).

• H(Heated) :H(Heated) refers to the stone is heated without adding other ingredients, and no other ingredients are injected throughout the process. Changing the color and clarity of the gem does not change the properties of the gem, and the overall effect is relatively stable. This pure physical optimization method is recognized internationally ✅, so the market acceptance is high.

• H(a)(b)(c)(d)(Be)：H(a)(b)(c)(d)(Be) refers to the addition of other materials, such as sodium fluoride, borax, polyphosphate and other compounds, on the basis of the old burning process, so as to achieve the purpose of improving color, transparency and clarity. For example, beryllium diffusion treatment of sapphire. After the chemical substances are added to the new burn, the nature is no longer a natural gem, and there may be residues, and the clarity of the stone will be affected. The value is extremely low and it is generally not recommended to buy ❌.

⚠The difference between H(Heated) and H(a)(b)(c)(d)(Be) is that H(Heated) does not add any other ingredients, while H(a)(b)(c)(d)(Be) adds chemicals!

🔔How to distinguish?

The best way to identify whether a stone has heated is to rely on a certificate issued by an authoritative laboratory.

“H(Heated)” belongs to the category of physical “optimization” gems, and the identification certificate does not need to be indicated in accordance with national standards.The “H(a)(b)(c)(d)(Be)” is the addition of chemical substances in the treatment process, which changes the nature of the gem, which belongs to the category of “treatment” and needs to be specially marked on the identification certificate.

➊ No indication of thermal treatment and heated can not be distinguished by the eye, can only be measured by laboratory instruments.

➋ For the average person, the easiest way to identify if a gemstone is heated or not is to have a reliable gemstone identification certificate! Mainly look at the annotation after Comment on the certificate:

• No indication of thermal treatment:Indicates no heat treatment or optimized treatment, natural gemstone.
• H(Heated):Indicates that after simple heat treatment, no other ingredients are added.
• H(a)：Indicates that after heat treatment, the residue is not obvious.
• H(b)：Indicates that after heat treatment, there is a small amount of residue.
• H(c)：Indicates that after heat treatment, there is a moderate amount of residue.
• H(d)：Indicates that after heat treatment, there is a large amount of residue.
• H(Be):When heated, beryllium(Be) is added to change the color.

⚠You must be careful when you encounter “H(a)(b)(c)(d)(Be)”, it is not recommended!

In general, gemstones with No indication of thermal treatment are considered the most natural and have the highest value; Although the H(heated) stone is heat treated, but no foreign substances are added, so it still maintains a high value; However, the value ofH(a)(b)(c)(d)(Be) gemstones may be negatively affected due to the addition of foreign substances. When buying a gemstone, it is very important to know whether the stone has been heat treated and the type of treatment, as this directly affects the value and investment potential of the stone.