Precious stones include the most expensive, pure, natural jewels; semi-precious stones, including agate, cat's eye, and amethyst, are priced in the middle; man-made jewels are least expensive.
貴重珠寶指的是高價位的鑽石、天然珍珠和純藍、綠、紅寶石；半寶石的價位中等，包括瑪瑙、貓眼、紫水晶、土耳其石等；人造寶石的價格最便宜。