Celtic Knot Blue Topaz Pendant Sterling Silver Necklace 16 Inches The beauty of Irish knot work is how it&#039;s a continuous loop symbolizing eternity, a beauty you can honor with this cut out style Celtic trinity. A 1.3in station set blue topaz clad charm on a 16in chain. Measure: 0.4in With 16in Chain, Weight: 7.7 gram, Stone: 8 mm x 4 mm, Material: .925 Sterling Silver, Blue Topaz