Blue Nile’s Valentine’s Day sale runs through February 14. You can find everything from diamonds to sapphires, emeralds and ...

If amethyst isn’t the stone you’d choose ... The luna sapphire and diamond ring from Blue Nile is a timeless ring with a modern look. Around the band, diamonds and deep blue sapphires ...

Gift a pair of oval amethyst line drop earrings ... a band of bright rose gold, making this ring easy to wear while still being extravagant. Blue Nile’s pear-shaped emerald diamond pendant ...

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Overall, only 2.1% of the pine trees' rings and 1.3% of the juniper shrubs' rings were blue; the cells which hadn't lignified properly were mainly found at the end of growth rings, in latewood ...

Intensely colored African Amethyst set in sterling silver jewelry is a sight to behold; in this case, beauty is definitely not just in the eye of the beholder These Celtic knots in sterling silver ...

Blue growth rings found in woody plant stems represent years when cells did not lignify properly because of summers too cold for growth When the going gets cold, even tough trees struggle with ...

The United Nations warned of a deteriorating humanitarian situation in Sudans South Kordofan and Blue Nile states, cautioning that the crisis is nearing a catastrophe as violence continues to ...

Blue rings found in the stems of trees and bushes in Norway point to a historic cold period in the late 1800s, but the exact cause of this climatic event remains unclear, scientists say.

Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the weather of the past by looking at tree rings — which can tell us far more than just the trees’ age. ‘Blue’ ...