Japanese twin pronged kanzashi with an agate ball. Late Meiji/Taisho period. Kanzashi is 6" long and the diameter of the ball is 3/4".
In the old days of Japan, agate was treasured as one of the sacred treasures. The Seven Sacred Treasures of Japan (Shippo), which originally came from the Buddhist surta, are gold, silver, ruri (lapis lazuli - blue stone with purple tint), shako (sea shell), agate, pearl, and maie (sea shell). Some are replaced with coral or crystals (old glass) depending on the different teachings.