The hypothalamus produces thyrotropin-releasing hormone (TRH), which stimulates the pituitary gland to release thyroid-stimulating hormone (TSH).
Water Opal is a colourless, clear opal with a play of colour. It is rare and valuable in the Realms, where it is used in scrying devices.ater Opals are valuable gems in the game which may be found. This item appears in Baldur's Gate (game) , Baldur's Gate: Enhanced Edition, Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition.
Opal is a very common material that is found throughout the world. Most of this opal is common opal or potch which has a milky or pearly luster known as opalescence. However, rare specimens of opal produce brilliant color flashes when turned in the light.These color flashes are known as a play-of-color.ome opal does not exhibt a play of color, does not have a base color, and does not have a body color like most common opals. But this material is still opal. The tumbled opals at right are examples of this material. It has been called water opal and hyalite..