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The price matrix for brilliant cuts alone exceeds 1,400 entries, and even this is achieved only by grouping some grades together. There are considerable price shifts near the edges of the size bands, so a 0.49 carats (98 mg) stone may list at $5,500 per carat = $2,695, while a 0.50 carats (100 mg) stone of similar quality lists at $7,500 per ...
The value of a diamond gemstone depends upon colour and quality, as well as weight. As of April 2024 the average price per carat of diamonds of between 1.00 and 1.49 carats was US$4,448. [48] The price of diamonds dropped significantly from a peak in 2022; prices of natural gems in shops dropped by 26% by the beginning of 2025.
The company owns the Kagem emerald mine in Zambia and the Montepuez ruby mine in Mozambique. Gemfields produces around 25% of the world's emerald supply and around 50% of the world's ruby supply. [6] [7] In addition to the gemstone mining and production assets the Group also owns and operates the Fabergé luxury brand.
^ Florida's state gem, moonstone, was adopted to highlight Florida's role in the United States' Lunar program, which landed the first astronauts on the Moon. [ 81 ] ^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock ( Plymouth Rock ), State Explorer Rock ( Dighton Rock ), and State Building and Monument ...
GIA also exists to educate the gem and jewelry industry and the general public through its publications and outreach efforts. Most notable of these efforts is the quarterly publication of the magazine Gems & Gemology, a respected journal in the field. The journal includes full-length feature articles, as well as reports on GIA research ...
In Australia, there are numerous gem shows, including an annual gem show called the GEMBOREE, which is a nationwide lapidary competition. There is a collection of gem and mineral shows held in Tucson, Arizona, at the beginning of February each year. The event began with the Tucson Gem and Mineral Society Show and has now grown to include dozens ...
The American Gem Society (AGS) is a trade association of retail jewelers, independent appraisers, suppliers, and selective industry members, which was founded in 1934 by Robert M. Shipley. The Society is based in Las Vegas, Nevada , along with the affiliated American Gem Society Laboratories (AGSL) (founded in 1996) and the American Gem Society ...
[11] [27] [28] Because of the rarity of large rough Yogo sapphires, Yogo gem prices begin rising sharply when they are over 0.5 carats (0.10 g), and skyrocket when they are over 1 carat (0.20 g). [22] [25] [27] Montana sapphires in general come in a variety of colors, [16] [18] [23] but Yogo sapphires are almost always blue. [27]