TIPS FOR BUYING
1 . Yellow Sapphire : Precious gem
Heat- treated yellow
sapphires can be determined by keeping them
under strong monochromatic radiation . If stone changes colour
then it is a treated one .
2 . Emerald :
Flawless emeralds are hard to find ,
they must be transparent and not opaque
All other green stones are translucent to opaque.
3 . Diamonds :
All diamonds fluoresce .The dominant colours observed in natural
are blue to green.If however orange pre-dominates the stone then there might be a doubt about the integretiy of the stone.
4 Ruby :
All natural rubies fluoresce in bright sunlight while it's simmulants look dull.
5 Sapphire :
If colour zoning or growth lines are observed in the blue stone then it signifies that the stone is a natural one .