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Boulder opal diamond & 18ct rose gold pendant on 18ct rose gold diamond set chain

This is a lovely pendant and chain.

In the centre of the pear shaped pendant is a semi-pear shaped cabochon cut boulder opal.
The boulder opal has thin colour bars & interesting patterns which leads us to believe that this is a Koroit boulder opal from the Queensland area of Australia.

The boulder opal is surrounded by a frame of small round diamonds and is suspended from a loop set with an old Dutch cut diamond.
The closed back of the 18ct rose gold setting has a beautiful scroll/foliate pattern.

The pendant hangs on an 18ct rose gold chain that is set with round diamonds in spectacle settings.

Estimated weights colours & clarities:
The opal:
Estimated weight: 19.45ct
Cut: semi-pear shaped cabochon cut
Estimated colour: opaque green & blue on boulder matrix
Estimated clarity: EC (eye clean)

The diamond:
Estimated weight: 0.25ct
Cut: old Dutch cut
Estimated colour: F - G
Estimated clarity: VVS - VS

The 55 diamonds:
Total estimated weight: 1.02ct
Cut: round brilliant cut
Estimated colour: F - G
Estimated clarity: VVS - VS

Weight incl. chain: 0.57ozs - 16gms
Length of chain: 17.98ins - 45cms

Weights, colours & clarities of the stones are estimated as the stones have been examined and measured in their settings. Where the stones carry an independent certificate this will be indicated.