Jewelry is a classic Valentine’s Day gift ... you can switch out the stone for a beautiful black onyx or a luxurious blue topaz. These blue and white topaz eternity hoop earrings are refined ...

Taken from a tree in Norway, this stained tree sample shows a blue ring from 1902. (Credit: Pawel Matulewski and Liliana Siekacz) Human skin isn't the only thing that can change color after facing the ...

Scientists have discovered that peculiar "blue rings" in wood samples reveal the aftermath of chilling volcanic eruptions that disrupted growing seasons over a century ago. When summers turn ...

A blue ring formed in 1902 in a tree in northern Norway. Image by Pawel Matulewski and Liliana Siekacz. Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the ...

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 ...