to green and blue. This bezel setting provides maximum protection and durability for such a special stone. "Gypsy" dome ring with Ethiopian opal in 14K yellow gold, $1,830, sigwardjewelry.com.

In photos taken of Swift walking outside her N.Y.C. party, she's seen showing what appears to be an opal ring surrounded by a halo of blue gemstones ... (Including Pink, Green and Blue Diamonds!) ...

Gucci 175-Carat Green Tourmaline Necklace Gucci These jumbo-size gemstones ... in light and airy designs. A rare 10-carat round antique European cut diamond floats on a carved floral-cut opal ...

Birthstones are gemstones such as opal, emerald, ruby ... “sea”, and the stone’s possible colors range from light blue to blue-green, or green. Roman fisherman used to carry this stone ...