A 7x5mm oval Sleeping Beauty turquoise with 0.31 carats of pear blue apatite, 0.26 carats of oval and round Ethiopian opal, and 0.07 carats of round neon apatite in solid 10K yellow gold on an 18-inch Singapore chain - the multi-gemstone pendant necklace that combines four distinct gemstones in a single fine jewelry composition. Sleeping Beauty turquoise provides sky blue; blue apatite adds vivid ocean blue; Ethiopian opal contributes its characteristic play-of-color; neon apatite delivers a bright, electric blue-green. Together in solid 10K yellow gold, the four stones create a blue-spectrum composition that rewards close inspection. Singapore chain, spring ring clasp.