My sister, designs jewelry and has her jewelers certificate, she likes sapphire as sapphires come in all different colours. Rubies and sapphires are technically the same stone, both come from corundum. Tanzanite which is a beautiful rare stone is a form of zoisite.
Get my sister talking about this stuff and she won't stop.
So whichever name you pick, they are all pretty stones.
I'll stop now or she'll keep on going
~Marly