Just writing this as I've heard you left the SU wiki chat a month ago, and blocked and unfriended several people from there. So, I just wanna make sure you're ok, and apologize for anything I did wrong.
Except her model sheet only shows the lower half of her gem, which is the same color as the one in the image provided.
Furthermore, Lapis's gem was also consistently shown as a single color in every episode she's in beside Change Your Mind, in which she got a new design with a new model sheet. If we didn't have her most recent model sheet, the same argument could be used to say Lapis's gemstone should be altered to be plain.
Furthermore, we have never seen a gemstone lose details in fusion, so it's very unlikely that the change in pattern is intentional.
If the shape is so minute, hardly any detail will be placed on it. It'll be just a solid color, which is exacerbated here due to the sheer sizes of the fusions. It's borderline sloppy but it really doesn't detract much from the scene it's in. Be that as it may, there's literally no reason why a gemstone can defy light and shading after a fusion.
As Ludexkoo said, Obsidian's gems changing aren't due to her actual gemstones changing in detail, they're because she's so massive that drawing her gemstones in detail in every scene would be a hassle.
Though, going through Lapis' gallery myself, I'm starting to believe her gem not having a highlight pre-"Change Your Mind" is intentional. All shots of her back have the gem with no shading, even when it's front and center. That's way too many times for it to just be an animator goof up.
And before you debunk me on this, a similar thing happened with Amethyst; her gemstone was a deep purple originally, and the colors became lighter and brighter following her final regeneration in "Reformed", and stayed that way ever since.
Addendum; also, while Obsidian's gemstones may just be drawn that way for simplicity's sake, that's still how they're presented within the wiki. Why should Malachite's gems be treated any differently?
That's usually how Cabochon gems are. They're literally just a single color, it's the shading and lighting that gives them their different color. Pearl's gem isn't slightly pink with a small band of slightly darker pink on the bottom, it's entirely slight Pink but the lighting choice causes the gem to have shading. It's just a matter of whether or not you want to add shading.
Yes, Koo, we agree that Lapis's gem is currently not a single solid color, but what Crossover Enthusiast is trying to imply is that this was a decision only made for the new Lapis design, and as such Malachite's gemstone doesn't have it due to it being made from Lapis's old design.
Lapis' gem on Malachite didn't have any features that were added or removed, outside of color. It's just that the artists didn't add shading to it when animating Malachite. Shading is just a fundamental phenomenon that occurs with light. And unless Lapis' gemstone on Malachite is perpetually emitting light, there's no reason why it cannot have shading on it.
Yeah, but in that same vein, why would we portray it as having shading (or in the case of the current render, highlighting) when it has never been shown that way? Sugilite and Alexandrite are just as big as Malachite is, and they at least have multiple shots where their gems are fully detailed. Malachite has no such thing.
All of the scenes where we see Lapis's gem on Malachite its unshaded because it was just left unshaded due to being a fast scene or not much focus is supposed to be on that area. Even Lapis herself has multiple scenes where her gem is unshaded. Using the shaded or unshaded versions of the gem is just a matter of preference in the wiki. And I'd rather we use the shaded version because it looks more appealing.
Perhaps you should redirect your vision to the portion of that model sheet that describes her gemstone as "glowing", which directly indicates that her gemstone is not being shown in its correct coloration.
I have a collection of images of steven universe, where I put some images of characters in folders on my pendrive, and some of those images are some of your pngs, and I'd asking your permission to continue using them in my collection. Do not worry, if someone asks me for a png made by you, I give the credits