precious metals and their alloys sold by weight; precious and semi-precious gem stones and synthetic and simulated gem stones; horological and chronometric instruments, namely, clocks, watches, timepieces, timing devices, and movements therefor; jewelry and personal adornments, namely, necklaces, bracelets, earrings, lapel pins, arm bands, tie pins, cuff links, watch straps of precious metal, with or without precious, semi-precious, synthetic, or simulated gemstones