Terminology and description according to the International Amber Association (IAA)

Modified Baltic amber (succinite)

Heat treatment or pressure treatment of one nugget. This process can affect the clarity of the amber and sometimes the color. It is also possible that this may affect the shape. It is similar to "Pressed" amber, but the difference is that the modified amber is defined as a single whole. It cannot be mixed with others, unlike "Pressed" amber. It follows from this that "Modified" amber undergoes only heat treatment or high pressure treatment, which changes its physical properties, including the degree of transparency and color. It can be seen how this is done with individual parts that contain fossils (insects and the like). Done correctly, this allows for better observation of the interior of the samples.

Pressed Baltic amber (succinite)  

It has long been known that Baltic amber softens and becomes fusible at temperatures ranging from 140 to 200 degrees Celsius in an airtight environment. The pressure for this is usually 200-300 kg per cm2. This is a useful technique where smaller pieces can be squeezed together to form larger or irregular pieces. On the other hand, it can also help cleanse them. Often used for jewelry, this processing method is fairly common. Some of them show "sun sparkles", which can add beauty to the piece. This is done artificially using heat and pressure in the oil. This is rarely seen in the natural way, but if it is, the glitters will not be evenly scattered as with artificial treatment. It follows from this that "Pressed amber" is a stone,

Baltic amber (succinite) (doublet, triplet)

A gemstone consisting of two or more parts of natural, modified or pressed Baltic amber, bonded to each other using the smallest possible amount of a binder required to join the parts. The following abbreviations can be used to describe the degree of modification of a gem:

• N - no changes
• H - heat treatment
• HPHT - High Pressure, High Temperature.