Hello,

I was wondering if these are real how do I attach them to the cake? They look too shiny to be gum paste? Thanks!

those could totally be gumpaste if they were dusted and painted properly.

Either press them into your cake, or cut the spheres in 1/2 so you can attach the flat side to your cake (with some edible glue: recipe avail on Cake Central)

These look like real ones to me...you can see the prongs holding the stones onto the settings. 
 

I believe they are all real.  If you enlarge the picture you can clearly see the prongs and backings.  You can get real close with gumpaste and isolmalt in moulds and the right techniques (I haven't really haven't experimented with it yet) but stone/glass have a very different, how do I describe, feel, look and hue about them.  Sorry about my attempt to explain. :(

Oh I can tell they are real. What I cannot tell is whether they were pushes into icing or attached with chocolate or something. I know that comes with experience but I am just curious how she can tell so maybe I can see it too

I was responding to the OP's question..........asking how to attach them to the cake if she were to do similar.

The cake looks cold because there's no sheen to it.

Someone with a huge amount of patience and time could make those jewelry pieces starting by making the fake metal settings underneath the stones. I haven't seen any cake decorator reproduce that kind of shine on the pearls. The best chocolatiers using good molds don't get that same look, they aren't as round or they couldn't get them to release from their mold. You'd need to use a silicone mold to get that round shape and you can't get that depth of shine in those. 

If the person making that cake was that skilled to make those jewels, they certainly would have frosted the cake better. Just like the 3d bride cake on the other thread.....there's too much expertise in a couple areas and none in other areas of the cake. An expert doesn't perfect some areas and leave others to look like pooh. usually.

I think they are falling off because of weight. My guess is the person who made the cake opened the brooch and pushed the pin directly in cake. Which makes it appear the pin side is close to the cake and non-pin side is tilted up. The larger brooches are at the bottom due to weight. The pearl one would be light compared to the rhinestone ones.
 

Those are all real. I have one like the one on the bottom left.

I'd also use melted chocolate to attach them directly to the fondant, or I'd take a drink stir, insert the pin part into that, then insert the stir into the cake. I'm not a huge fan of putting real jewelry on the cake, but as long as the pins aren't inserted directly into the cake I'd be okay with it.

I am recently engaged and want to make this for my wedding cake... I'm just trying to decide if I should go the isomalt and mold way, or if I should just buy some brooches.... I have a year until my wedding so that would give me plenty of time to practice!

You'll never get as shiny a look if you use isomalt. They just don't look like real ones no matter what you do. You also need a spotlight at the reception that's aimed at the cake table to really get a shine on the cake if you want it to be sparkly, so keep that in mind when you're planning the reception setup.

Also, are you insane to want to make your own wedding cake, or are you just a control freak like I am? I'd say don't do it, but I know that I would (and did) so who am I to talk.

lol. Mostly I am poor and refuse to pay someone else what I am fully capable of doing! And a little bit of a control freak perhaps.

And thanks for the tip of the spotlight!