These are the tiny wasp parasites emerging from the amazing golden chrysalis of the Blue spotted crow butterfly
The best way to spot these golden sculptures is out at night, where their highly reflective surface shines bright in the torchlight. I have seen them on railings on the Peak and on Lung Fu Shan, and in more forested areas, under leaves, on a forest path. Always a wonder to behold, and very tricky to photograph, as it shines in the flash. I used a torch to light the little wasps, as well as off camera diffused flash for this.