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The various enhancements used today include:-
Is defined as the controlled heating of certain stones in order to effect a change of colour. Certain stones are amenable to such heating and are considered quite stable while others are not. Since no two stones are alike, each possesses the potential to react differently. Stones in which the heat treatment is considered stable are considered commercially acceptable.
Detection for the most part is difficult. In some cases, identification is based on the fact that certain colours are rarely found in nature and are therefore considered to be enhanced. In other instances, the procedure is so widespread ( i.e Citrine Quartz) that it is automatically assumed to be treated.
Example: Blue Zircon which is produced by heat treating Brown Zircon.
Confined to a smaller group of gemstones, this process can occur in a variety of ways:-
Caused through exposure to alpha particles emitted by radium salts.
Stones are radioactive and will fog a photographic plate if left in contact for several hours in a light proof box. The colouration (green in the case of diamond) is on the surface only and is normally detectable upon close examination.
Bombardment by particles accelerated to enormous speeds in a cyclotron. In diamonds, the colour produced varies from green to black dependent on the length of the treatment.
Detected by immersion in a highly refractive liquid since the colour is on the surface only. Yellow diamonds produced by further heating show a characteristic absorption band not seen in natural yellow diamonds. Treated stones will invariably show a ring around the girdle or an umbrella effect around the culet.
Irradiation with neutrons from an atomic reactor. Colouration is through the entire stone rather than on the surface only.
Brown and yellow diamonds produced by this method have a characteristic absorption band at 594nm but green diamonds are undetectable except for a variance in colour compared to the naturally occurring stone.
Colouration produced by using an accelerator. Colouration in the case of diamonds ranges from a pale blue to a blue green but is on the surface only. Colour resembles a rare type of diamond known as Type llb diamonds.
Detectable by the fact that treated diamonds are non-conductors of electricity while natural blue diamonds are semi-conductors. Surface colouration is evident when the stones are immersed in a highly refractive liquid.
Most irradiated stones are considered stable but there are more cases of instability than in heat treated stones. Again commercial acceptance hinges on the degree of stability while public disclosure is open for debate.
These can include any of the following:-
Reasons for using impregnations
Can be through the application of any of the following:-
Stones constructed of two or more pieces of material which may or may not be genuine. Composite stones can fall into one of the following categories:-