PRECIOUS STONES (OTHER THAN DIAMONDS) AND SEMIPRECIOUS STONES, WHETHER OR NOT WORKED OR GRADED BUT NOT STRUNG, MOUNTED OR SET; UNGRADED PRECIOUS STONES (OTHER THAN DIAMONDS) AND SEMI-PRECIOUS STONES, TEMPORARILY STRUNG FOR CONVENIENCE OF TRANSPORT - UNWORKED OR SIMPLY SAWN OR ROUGHLY SHAPED: SEMI-PRECIOUS STONES: AGATE