world's largest emerald - size of a watermelon

11.5-kg emerald up for auction in Kelowna

Kyanite is a mineral infrequently cut as a gemstone. It occurs in light to dark blue, green, colorless and brown colors in a transparent form with the blue color being most used in gemstones. Kyanite is of interest because of the extreme variablity in hardness with direction. In one direction, the hardness is 4.5 and in the other it is 7. The finest gem quality Kyanite may be confused in appearance with spinel or blue sapphires from Burma.

Kyanite from Merelani Hills, Lelatema Mountains, Arusha Region, Tanzania - unusual blue color Kyanite, Blue Throat Eye Projective Jupiter Water Purification Psychic Powers Mental Powers

amethyst with a citrine crystal growing in the center

OMGosh I absolutely LUV thia amethyst with a citrine crystal growing in the center like a candle

Photograph of an uncut sapphire crystal (171220) from the National Mineral Collection. Photo by Chip Clark.

Sapphire Gemstones Photograph of an uncut sapphire crystal from the National Mineral Collection. Photo by Chip Clark.

The Rare Gemstone Ammolite.  This dazzling iridescent fossil of an 80 million year old ammonite measuring 2 feet in diameter was discovered near Alberta, Canada and is a particularly rare example of an ancient sea creature that went extinct at the same time as most dinosaurs. The spectacular coloration is the result of millions of years of high temperatures and pressures, creating a gemstone known as ammolite.Ammonite, opalised, 254nm fluorescence, photograph by The Bob. Magnificent piece!

Opalized 80 million years old Ammonite measuring 2 ft. in diameter, discovered near Alberta, Canada. Shown here under fluorescent light. Hands down, the most beautiful ammonite I've ever seen!

Stibnite

Black Turmaline, one of my favorites; Exploring the Hall of Minerals --photo by Nervous System

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