Black Obsidian Gemstone Chip Necklace - These Semi precious gemstone necklaces/jewellery making strands are a funky way to add some creative colour to an outfit as a simple jewellery necklace use one or use a few for a creative mix. The chips can also be perfect for use in the creation of your own wonderful pieces. We have a huge range of gemstones available in this range. As a necklace they have a 45cm drop and the complete strand length is 90cm. The chips range from 0.6cm to 1.2cm approx in width.