A white gold and platinum single stone diamond ring

A white gold and platinum single stone diamond ring,
with diamond set shoulders. An old brilliant cut diamond, estimated as approximately 1.10ct, six claw set to a pierced geometric collet. A baguette cut diamond, rub set to each shoulder, to open shoulders and a plain shank. Tested as approximately 18ct gold and platinum. 15.10 x 7.70mm head, 3.48g. Diamond assessed as approximately:
Colour: I/J
Clarity: SI1/SI2.
Finger size P
Sold for £2,100

Condition report:
Marks to the mount, more to the lower half of the shank.