Hi ladies - believe it or not I’ve managed to track it down... it’s a Knot Open Link White Gold Diamond Necklace made by Boodles from their Knot Collection.
It’s a stunning piece and comes with a price tag that may leave you slightly stunned too!... £28,750
Details from Boodles:
A Knot design open link necklace comprised of round brilliant cut diamonds in 18 carat white gold . The total Diamond weight is 5.70 carats.
Here is a link to the actual piece - https://www.boodles.com/knot-white-gold-diamond-open-link-necklace/
Pic is attached