This rare purple-pink diamond could make $38M at auction No Comments Uncategorized A 15.81-carat diamond could fetch up to $38 million when it goes on sale in Hong Kong next week. A 15.81-carat diamond could fetch up to $38 million when it goes on sale in Hong Kong next week. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to print (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)