Jacinth - See hyacinth.
Hyacinth - Refers, generally, to a yellow, orange, brown, golden-brown, or reddish-brown form of (natural) zircon.
Zircon - A brown to colorless mineral, ZrSiO4, which is heated, cut, and polished to form a brilliant blue-white gem. Zircon is a beautiful natural gem, very different from man made cubic zirconia or CZ .
Jacinth is a semi-precious stone that is also known as hyacinth. It is a lustrous orange-yellow, orange-red, yellow, or yellow-brown type of zircon. Zircon has been prized since antiquity. Zircon's brilliant and intense fire surpasses that of even the diamond. Pure zircon appears colorless and is often used in place of diamonds. Impurities within the stone produce a variety of colors. It is believed that zircon will provide the wearer with wisdom, honor and riches, however if the stone loses luster it is said to warn of danger.
Zircon is a stone of purity and innocence. According to folklore it balances the emotions and enhances self esteem and unity. It was used as an amulet by travellers to protect against accident and injury on the journey. It was also used to stop the wearer from being stuck by lightening. Hindu poets tell of the Kalpa Tree, the ultimate gift to the gods, which was a glowing tree covered with gemstone fruit and leaves of zircon. Zircon has long had a supporting role to more well-known gemstones, often stepping in as an understudy when they were unavailable. In the middle ages, zircon was said to aid sleep, bring prosperity, and promote honor and wisdom in its owner. The name probably comes from the Persian word zargun which means gold-colored, although zircon comes in a wide range of different colors. Deposits can be found in Cambodia, Burma, Thailand, Sri Lanka, Australia, Tanzania and France.