Composite
Stones
The
composite stones are manufactured by gluing or fusing two or three stones.
To
identify these stones the stone is illuminated with a strong thin light from the
pavillon. To examine the stone in a
liquid gives a better result.
When
we examine the stone carrefully we will see;
-
The
difference in colour or luster in between the crown and the pavillon
-
A
separation plane around the girdle
-
The
air bubbles around the girdle plane
-
Colourless
girdle
-
irregularity
at the table
When composite
stones are made out of garnet and glass;
Put
the stone table down on a white paper, examine with a strong light from
different angles. A red ring will be noticed on the white paper.
Note: This red ring will not be visible if the stone is red, orange or
purple or the garnet crown is too thin.

Doublet:
It is made two coloured material or a colourless
crown and coloured pavillon by fusing or gluing with a colourless glue.
These composite stones are made from a colourless natural stone on the crown and
a coloured synthetic stone or glass on the pavillon.
This
sapphire doublet has a colourless sapphire as crown and fused to a synthetic
blue pavillon.
Triplet:
Either two colourless material are glued together with a coloured glue or three
piece are glued together with a colourless glue.
The
emerald triplet below is made from two colourless beryl glued with a green glue.
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