Peter, I know nothing about your methods or camera etc: but The Jewel Box
and the Gem Cluster are two very similar objects that respond well to a darkish background; makes them stand out better, and a neutral sky background colour is essential. I notice your image has an overall blue cast, which makes the image look a little garish.It also seems to be very noisy, did you use an uncooled camera and have a high ambient temperature at the time of capture? I have attached a pic of the JB which has a darkish background as mentioned, and another of the Gem which I deliberately gave an inky black background to make it punchy.
You really need to start from a neutral colour background, and then saturate the colour to taste.
raymo
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