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 ...

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’ ...

The cushion-shaped brilliant-cut blue diamond with VVS1 clarity is mounted on a platinum ring and flanked by round diamonds. Harry Winston jewels performed extremely well at the sale at Christie ...

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 ...