Sterling Silver Whitby Jet Curved Triangle Necklace. P320. This contemporary Whitby Jet and Sterling Silver triangular pendant has subtle curved edges which soften the points, giving a more cushion-like shape. Presented complete on a sterling silver 18" chain. All our Whitby Jet jewellery is designed and crafted within our very own workshops in Derbyshire where a team of skilled craftsmen turn the raw Jet into these stunning pieces of jewellery. You can find other matching Whitby Jet jewellery and other Whitby Jet rings online and instore. Dimensions: Pendant: 20mm x 13mm, Whitby Jet; 10mm x 10mm x 10mm.