45.52 CaratsThe Hope Diamond is 45.52 carats. By comparison the average engagement ring is only 0.3 carats.
The most expensive opal ever recorded is the "Olympic Australis," a rare black opal found in Australia. It was valued at around $2.5 million and weighs approximately 17,000 carats. This opal is known for its stunning play of color and rarity.
The Olympic Australis Opal is believed to be the largest gem opal ever found. The Olympic Australis weighs 17,000 carats (3450 grams) and is 280 mm long (11 inches) by 120 mm, by 115 mm. It was valued at AUD$2,500,000 in 2005.
The Olympic Australis Opal is believed to be the largest gem opal ever found, and it was found at Coober Pedy.Found in 1956 at the "Eight Mile" opal field in Coober Pedy, South Australia, the Olympic Australis Opal was found at a depth of 30 feet and so named because the Olympic Games were being held in Melbourne at the time.The Olympic Australis consists of 99% gem opal, with the remainder of 1% being the soil still attached to the stone. It weighs 17,000 carats (3450 grams) and is 280 mm long (11 inches) by 120 mm, by 115 mm. It was valued at AUD$2,500,000 in 2005.
Opal stones can range in size from a few millimeters to several centimeters in diameter. The largest opal ever found was known as the Olympic Australis, which weighed around 17,000 carats (3.4 kg) and measured about 30 cm in length.
The Olympic Australis Opal is believed to be the largest gem opal ever found. Found in 1956 at the "Eight Mile" opal field in Coober Pedy, South Australia, it was found at a depth of 30 feet and so named because the Olympic Games were being held in Melbourne at the time. The Olympic Australis consists of 99% gem opal, with the remainder of 1% being the soil still attached to the stone. It weighs 17,000 carats (3450 grams) and is 280 mm long (11 inches) by 120 mm, by 115 mm. It was valued at AUD$2,500,000 in 2005.
The density of opal typically ranges from 1.9 to 2.3 g/cm³, with an average density around 2.1 g/cm³. This can vary depending on the specific type and composition of the opal.
1.9 - 2.3, Average = 2.09
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Opals vary in size. Some of the best opals are fist-sized, but generally they are much smaller. The world's largest opal to be found, to date, is the Olympic Australis, which is 280 mm long, 120 mm high and 115 mm wide. It weighs 17,000 carats (3450 grams).
A price of a real opal necklace can vary, depending on the size of the necklace and where one would purchase it. Some opal necklaces can be purchased for $100, where others can cost in the thousands! The average price would have to be around a couple hundred dollars.
About 141.7 carats per ounce.