I admit that I'm a serial brooch converter, but every now and again a brooch needs to be a brooch. 
This stunning bar of alternating cushion old mine cut diamonds (dare I even say Peruzzi) and pearls, in alternating yellow and white gold settings. This has been beautifully crafted, and wears so well in a modern setting. Along the neckline of a cashmere sweater, on the collar of a denim jacket, or clipped into your Albert chain as a clever extender. 
I beleive this to have been made in the early 20th century. It bears a French owl import mark for 18ct gold, and features a trombone pin clasp, indicative of the period. The diamonds were likely cut much earlier. 
Stamped and tested as 18ct gold. 
Weight approx 4.85g
Length approx 40mm
Diamonds tested as natural, earth mined diamonds. All bright lively diamonds of around SI 1/2 clarity. 
Principle diamond approx 0.30ct
Total diamond weight approx 1.00ct
(Calculated in settings)
Pearls have not been x-rayed, so have assumed cultured.