A single stone diamond ring

A single stone diamond ring,
with an old European cut diamond with an estimated weight of approximately 2.00ct, claw set to a shallow rex collet. Four rose cut diamonds set to each shoulder, to a plain shank. 8.40 x 8.60mm, 2.25g. Diamond assessed as approximately:
Colour: J/K
Clarity: P1/P2
Finger size J½ - K
Sold for £1,800

Condition report:
Obvious carbon inclusiong to the centre of the diamond under the table.
Some nibbles to the girdle, indented natural and extra facet.
Diamond set shoulders very worn - have been let in from another smaller ring - tests as silver.
Claw worn - some deficient.
Has been restored before. Slight wear to the underbezel.
Lower shank very creamy - requires re-rhodium plating.
Tested as 9ct white collet, 14ct shank. Shoulders test as silver.
By our calculations diamond is approximately 2.02ct - re-polishing or tidying up may bring it under 2.00ct.