What about using [name]Gemma[/name] and [name]Jaida[/name] - Same sounds, but different spelling… (I’m not usually a fan of respelling a name, but I think that this circumstance might warrant it)
You could use the nicknames of [name]Gem[/name] and [name]Jai[/name]
they are matchy BUT if you made the minor switch to [name]Gemma[/name] (w/ no nickname) and [name]Jade[/name], you’d be set. Those are great together and since you thought of [name]Jade[/name] as a nickname anyway…
you may even like [name]Gemma[/name] [name]Mae[/name] and [name]Jade[/name] [name]Layne[/name] more than [name]Gemma[/name] [name]Layne[/name] and [name]Jade[/name] [name]Mae[/name] (there’s something about the two one syllable names together don’t you think?)
I like [name]Alya[/name], [name]Gemma[/name], & [name]Jade[/name] 
I like [name]Gemma[/name], [name]Ayla[/name], and either [name]Nola[/name] or [name]Lola[/name] for the other babe.
I think if you’re really sad about [name]Jada[/name] though, who cares if they’re a bit matchy! Keep it if you love it.
[name]Gemma[/name] and [name]Jada[/name] are way too matchy for twins. I would suggest changing one of the names to something less themed.
[name]How[/name] about:
[name]Gemma[/name] and [name]Ivy[/name]
[name]Gemma[/name] and [name]Cora[/name]
[name]Gemma[/name] and [name]Eva[/name]
[name]Gemma[/name] and [name]Lila[/name]
[name]Gemma[/name] and [name]Nola[/name]
[name]Gemma[/name] and [name]Thea[/name]
[name]Gemma[/name] and [name]Talia[/name]
[name]Gemma[/name] and [name]Clara[/name]
[name]Gemma[/name] and [name]Mira[/name]
[name]Gemma[/name] and [name]Mila[/name]
[name]Gemma[/name] and [name]Elodie[/name]
[name]Gemma[/name] and [name]Violet[/name]
[name]Gemma[/name] and [name]Iris[/name]
[name]Gemma[/name] and [name]Livia[/name]
[name]Gemma[/name] and [name]Chloe[/name]
[name]Gemma[/name] and [name]Ada[/name]
I have to agree, [name]Gemma[/name] and [name]Jada[/name] when nicknamed [name]Gem[/name] and [name]Jade[/name] are a too matchy for me. In full, [name]Gemma[/name] and [name]Jada[/name] aren’t bad together and I don’t think you have to nickname them- at least not officially. When you’re introducing them, or when they’re in school, would they go by [name]Gemma[/name] and [name]Jada[/name]? If so thats fine, I think, especially if they are the names you love. I actually think [name]Gemma[/name] and [name]Jade[/name] would be okay as well (a bit themey, but not too obvious) but [name]Gem[/name] and [name]Jade[/name] are too much. I liked your idea of [name]Gemma[/name] and [name]Elisa[/name], both are simple and girly. [name]Elisa[/name] is a little bit longer, so how about [name]Elsa[/name]? [name]Ayla[/name], [name]Gemma[/name] and [name]Elsa[/name]. Can you ask your husband if he has any ideas of names he likes? Sometimes it’s good to get an idea of what names he’s into (even if your not into them) so we can compromise. If seems like you like names that are soft and simple, somewhat classic and definitely girly. Here are some other suggestions (you can substitute [name]Jada[/name] for [name]Gemma[/name] if you want):
[name]Ayla[/name], [name]Gemma[/name] and [name]Zara[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Luna[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Bella[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Jane[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Stella[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Cara[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Gina[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Raina[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Clara[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Aria[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Leta[/name] ([name]LEE[/name]-ta, similar to [name]Lena[/name])
[name]Ayla[/name], [name]Gemma[/name] and [name]Rosa[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Alice[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Christa[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Tara[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Meera[/name]/[name]Mira[/name]
[name]Ayla[/name], [name]Gemma[/name] and [name]Dora[/name]
[name]Hope[/name] that helps!
OK - So here are a few ideas…
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Jaida[/name] [name]Mae[/name] ([name]Gem[/name] & [name]Jai[/name])
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Stella[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Calla[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Mira[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Maisie[/name]/[name]Maisy[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Oriana[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Orla[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Kerensa[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Mabyn[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Colette[/name] [name]Mae[/name]
[name]Ayla[/name], [name]Gemma[/name] [name]Layne[/name] & [name]Daisy[/name] [name]Mae[/name]
Middle name suggestions for [name]Mira[/name], [name]Maisie[/name]/[name]Maisy[/name], Maben and others: [name]Paige[/name], [name]Jean[/name], [name]Rose[/name], [name]Grace[/name], [name]Jo[/name], [name]Bree[/name]/[name]Brie[/name], [name]Faye[/name], [name]Joy[/name], [name]Lark[/name], [name]Rue[/name], and [name]Wren[/name] (Made them all 1 syllable as that it what you’ve chosen and might flow best with last name).