A livelier emerald twinkles in the grass, A purer sapphire melts into the sea.
I'm not an expert. I've been reliably informed it's a sapphire with some diamonds. But I'm sure everyone recognises it from previous times.
Oh, the summer night has a smile of light and she sits on a sapphire throne.
There bloomed the strawberry of the wilderness; The trembling eyebright showed her sapphire blue, The thyme her purple, like the blush of Even; And if the breath of some to no caress Invited, forth they peeped so fair to view, All kinds alike seemed favourites of Heaven.william wordsworth
In emerald tufts, flowers purple, blue, and white; Like sapphire, pearl and rich embroidery.william shakespeare