We can't found it directly because that was sold during an auction (09/2019) and not a classic sell on the website.
Here the link you can see all conan props sold during this aunction, the diamond is at the bottom of the page
Entertainment Memorabilia Live Auction 2019 | Prop Store
I love this diamond
the movie is not so good as the first one but it also belong to the legend of Conan ^^
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Now that I'm home, I have image access to my photos and the movie to take snapshots from to do a little comparison. I don't know if a resin diamond would sparkle and refract light like it does in the movie either? At the same facet locations as a glass or crystal version?
Movie (left) Vs. Tiffany Diamond Paperweight (right or down depending on how much screen space you have) I have lit similarly (both seem to have hard facet edges, which is why I find those smoothed edges puzzling). The angles and lighting aren't an exact match or even the rotation relative to the facets, but they certainly look very similar to my eyes. So if they didn't use a Tiffany paperweight, they sure used a similar made prop with the same facet cuts that seem to light up very similar from below. It does seem like the dimensions might be off a bit, but then they did come in different sizes. I went with the largest one I could find in mint condition.
Movie Extreme Closeup shows sharp facets (of course there's a movie overlay effect to it, but I assume they still used the gem for the foreground effect):
Close up with Castle holder (edges don't look softened to my eyes; I'll ignore the color mismatch with the yellow look from quoted post):
Compare angled-righted crop of above (left) to Tiffany LED bottom lit (rotated upside down to match holder on left with a bit of "blue" removed from the cooler LED light to closer match the lighting from the movie; of course they're not lit the same once again and the left one is rotated to the right by the looks of it a degree or two more than where I happened to set the paperweight, but the facet reflections aren't miles off either):
Distant Shot with LED Puck lighting it:
Again, I can't say what they used in the movie, but they didn't at least model it after the Tiffany paperweight, it's a hell of a nice stand-in prop and I got mine for a pretty reasonable price on eBay ($31 + shipping! The prices for these are all over the place, though. I got luck with that auction, but then people aren't typically looking at these as movie props, but rather as bric-a-brac. Throw in the light puck (~$25-30 and it makes a good mockup display. I already had a spare glass speaker stand to set the puck on for now. I'd love to make a pyramid shaped stand at some point if I could do it halfway well and it didn't block the aisle way (it is inside my home theater room).