Gemstones rarely found

Gemstones that are rarely found. 

Alexandrites

    Smithsonian museums' Alexandrite, the largest cut alexandrite weighing 65.08 carats.

Aquamarines

A birthstone.

    The Dom Pedro - The world's largest cut and polished aquamarine. Housed in the permanent collection of the Houston Museum of Natural Science

Diamonds

    See List of famous diamonds

Opals

    The Andamooka Opal, presented to Queen Elizabeth II, also known as the Queen's Opal

    The Aurora Australis Opal, considered to be the most valuable black opal

    The Black Prince Opal, originally known as Harlequin Prince

    The Empress of Australia Opal

    The Fire Queen Opal

    The Flame Queen Opal

    The Flamingo Opal

    The Halley's Comet Opal, the world's largest uncut black opal

    The Jupiter Five Opal

    The Olympic Australis Opal, reported to be the largest and most valuable gem opal ever found

    The Pride of Australia Opal, also known as the Red Emperor Opal

    The Red Admiral Opal, also known as the Butterfly Stone

Pearl

    Arco Valley Pearl

    La Peregrina

    Satlada – A seven-stringed pearl necklace of the Nizams. Most pearls are white but can be other colors as well.

    The Pearl of Lao Tzu - Philippines

Ruby

    The DeLong Star Ruby

    The Hixon Ruby Crystal

    The Midnight Star Ruby

    The Neelanjali Ruby

    The Rajaratna Ruby

    The Rosser Reeves Ruby

Sapphires

    The Logan sapphire

    The Queen Marie of Romania Sapphire

    The Ruspoli Sapphire

    The Star of Asia Star Sapphire

    The Star of Bombay, given to Mary Pickford by Douglas Fairbanks, Sr

    The Star of India

    The Stuart Sapphire

    The Black Star of Queensland, with a weight of 733 carats (147 g) The largest star sapphire in the world.

Spinels

    The Black Prince's Ruby, actually a spinel mounted on the Imperial State Crown

    The Samarian Spinel, the world's largest spinel

    The Timur Ruby, believed to be quartz until 1851

Topaz

    The American Golden Topaz, the largest cut yellow topaz, weighing nearly 23000 carats (4.6 kg).

    The Chalmers Topaz, a 5,899.5-carat (1.1799 kg) cut topaz.