Large Pledge ring with sapphire and diamonds

18ct yellow gold Large Pledge ring set with Australian parti sapphire and white diamonds.
I have had this stone in my collection for a couple of months and finally found the right design for it.
The colour is a teal blue/green, very hard to describe. It changes in the light, so is difficult to photograph. The above photo has more of a hint of blue to it, the below, look more green.
Often when I post pieces there is an assumption that there are multiples of this ring.
There is only one of these rings, I can not match this stone, it is a unique sapphire.
With rubies and Ceylon sapphires, I am able to match stones, but not with these natural sapphires.
This ring was delivered to e.g.etal last week and is available for viewing at the gallery.