This is literally Clara's favorite earring pack. She wore these earrings throughout most of Season 7. Topshop originally sold three different colored sets. There was this bright red/green/orange set, a lighter red/green/yellow set, and a pastel pink/blue/yellow set. They are equally rare, but even if you found a color alt, it would be possible to paint them to match the accurate colors. Red Dots worn in: The Bells of St. John (outfit #1), The Crimson Horror (outfit #3), Nightmare in Silver Green Solids worn in: The Rings of Akhaten Green Dots worn in: The Bells of St. John (outfit #2), The Name of the Doctor.
House of Harlow 1960 Arrowhead Earrings
These earrings got a late ID, but several people have found them since. One thing of note: the black portion has an interesting golden sheen. And it is slightly raised in the center, like a real arrowhead vs a enamel pour.
Worn in: Cold War, Listen
Urban Outfitters Triangle Enamel Post Earrings
I don't know how rare these are, because not many people search for them. This is partly because it is so easy to find a solid silver alt for and paint the black on with nail polish. I used a pair of earrings from Forever21 as a base.
Worn in: Journey to the Center of the TARDIS (outfit #1), Journey to the Center of the TARDIS (outfit #2)
Topshop Mixed Outlaw Stud Earring Pack
I am hoping this will be season 8's new hexagon earring go-to pack. It will just make life so much easier. I've seen several partial-sets on eBay, and there is a brand called Odile & Fleur that seems to sell overstock jewelry which you might want to check. Also, I may be taking a liberty IDing the DOTD studs, but we'll probably never get a better ID, and I like closure.
Round Bronze Studs worn in: The Day of the Doctor Wings worn in: Robots of Sherwood Leaves worn in: Season 8 unknown outfit 6
COMPARISON SHOT OF THE DAY OF THE DOCTOR EARRINGS.
Clara also wore many other earrings which remain unidentified. Square diamond studs, dangly silver loops, bronze studs, black pearly studs, triangles again, and whatever those Kooples outfit earrings are. If you wouldn't mind, keep an eye out for these, and spread the word if you do find an ID. And if you have better pictures or screen shots, email them to me and I'll put them up.