Question 1

Why do chameleon diamonds change colour?

Accepted Answer

Chameleon diamonds change colour temporarily when warmed or after being kept in the dark, usually from green towards yellow. Research links the effect to defects involving hydrogen and nickel, which respond to heat and light, but scientists have not fully explained the mechanism. The change is reversible and does not damage the diamond.

Question 2

Is the colour change in a chameleon diamond permanent?

Accepted Answer

No. The colour change is temporary. After heating or storage in darkness the stone shifts towards yellow, then returns to its stable green colour as it cools or is exposed to light, usually within minutes. The stone can repeat the change many times. Laboratories grade the diamond on its stable colour.

Question 3

How do labs identify a chameleon diamond?

Accepted Answer

Laboratories observe the colour change by gently heating the stone and by keeping it in darkness, then comparing its colour. They also note characteristic features such as strong fluorescence and persistent phosphorescence. The report records the stable colour grade, may include a comment on the chameleon effect, and confirms whether the colour is natural.

Question 4

Are chameleon diamonds rare?

Accepted Answer

Yes. Chameleon diamonds are a small and unusual group within natural fancy colour diamonds, and stones showing a strong, clear colour change are uncommon. They appeal particularly to collectors. Supply is irregular, so a specific size or shape may take time to find, and pricing depends heavily on the strength of the effect.

Chameleon Diamonds