Urchin - small, St Martin's - solid 9ct goldI love this urchin it looks very special. It makes a lovely charm but works well on a neck chain too just select your preferred option from the drop down menu. The urchin is solid 9ct yellow gold, is 12 mm long and weighs 4. 2 g. In the second image the 'small' urchin is on the left, with the 'little' urchin and 'tiny' Tresco urchins to the right. This piece is hallmarked. Please allow up to 3 weeks for delivery on gold.