 | Musgravite is an aluminum oxide with variable proportions of magnesium, iron, and zinc. It was originally discovered in 1967 in Musgrave Ranges, Australia. One of the rarest and most valuable gemstones in the world, The GIA describes musgravite as “a rarity among the rare … a particular gem on our research examination ‘want list'” |  This very rare and hard gemstone is in the same family as taafeite. |
 | There are only a handful of known examples. The Ophir Collection contains the 1st, 2nd and 3rd largest cut musgravites in the world. The 214.16 carat Ophir Grand Musgravite was originally thought to be a taaffeite gemstone, another incredibly rare gem. The 21.07 carat Ophir Red Musgravite is the largest cut red musgravite, and the 3rd largest cut Musgravite in the world. |  |
 | The 22.64 carat Ophir Musgravite was recognized by the Guiness Book of World Records as the largest cut musgravite in the world. However, the GIA certified The Ophir Grand Musgravite, which now takes the title. Recently, tiny quantities of musgravite have been found in Greenland, Sri Lanka, and Tanzania. It's Mohs scale hardness is 8–8.5 |  |
