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Savalia savaglia, commonly known as gold coral, is a species of colonial false black coral [2] in the family Parazoanthidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea where it often grows in association with a gorgonian. It is extremely long-lived, with a lifespan of 2,700 years, and develops into a large tree ...
Precious coral, or red coral, is the common name given to a genus of marine corals, Corallium. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton , which is used for making jewelry .
Rose gold jewelry is becoming more popular in the 21st century, and is commonly used for wedding rings, bracelets, and other jewelry. Although the names are often used interchangeably, the difference between red, rose, and pink gold is the copper content: the higher the copper content, the stronger the red coloration.
Hawaiian gold corals display an interesting growth mechanism, spreading at a rate of about 2.2 ± 0.69 cm yr−1 cm per year. [3] Radiocarbon dating has been used to determine the radial growth rate of K.haumeaae which exhibits a relatively slow radial growth rate with a remarkable age of 807 ± 30 years for a live-collected specimen, highlighting the species' exceptional longevity. [4]
Pavona clavus is a cream, yellow, brown, or pale grey coral typically forming columnar or club-shaped colonies, though it may also form flattened plates. [ 3 ] [ 4 ] The columns are generally smooth and uniform in size, typically measuring up to 20 cm (7.9 in) tall and 3–5 cm (1.2–2.0 in) in diameter. [ 3 ]
Crown gold is a 22 karat (kt) gold alloy used in the crown coin introduced in England in 1526 (by Henry VIII). [1] In this alloy, the proportion of gold is 22 parts out of 24 (91.667% gold). Crown gold is appreciably less prone to wear than the softer 23 kt gold of earlier gold sovereigns — an important point for coins intended for everyday ...
Euphyllia ancora is a gonochoristic, and spawns in late spring in Taiwan via external fertilization. [6] As Twan has stated, E. ancora has been found to mass spawn [6] under the definition of Harrison and Wallace which states "the synchronous release of gametes by many species of corals in one evening between dusk and midnight". [7]
Electrum was often referred to as "white gold" in ancient times but could be more accurately described as pale gold because it is usually pale yellow or yellowish-white in color. The modern use of the term white gold usually refers to gold alloyed with any one or a combination of nickel, silver, platinum and palladium to produce a silver ...
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