I got the new jewel Dove's Flight by combining Pink Swirl and Black Diamond.
How to make a Zebra Jewel
This may sound strange but these little things seem to make a difference and all I need now is a couple more stars so I recommend you try the following:
Sell your jewel lab and repurchase another lab.
Be sure to keep selections aligned side by side. This IS important! Sounds strange I know.
In the left hand column select black diamond.
In the right hand column make sure that the black gold is aligned next to the black diamond BEFORE YOU SELECT it. Then you will craft Black diamond + black gold which is a zebra in 14 hrs.
Make a Rainforest Jewel
Just made a Rainforest Jewel by combining a Black diamond and Emerald Isl, it took 14 hrs and resulted in a RAINFOREST JEWEL.
Make a Sun Jewel
Make a Sun Jewel by firstly selling your jewel factory then repurchasing it (sounds odd I know but prior to this my mix kept giving me commits tail, once I sold the jewel factory I made a Sun Jewel). Make a Sun Jewel by mixing a Starry night + rainforest = 48 hrs and I got a Sun on first attempt.