Mon, 20 Mar 2017 22:15:09 +0000
The 14.02-carat Spinel from Sri Lanka is exceptional for its intense violet-blue color. Spinel is a magnesium aluminum oxide and forms when impure limestone is altered by heat and pressure. They are commonly found in occurrence with corundum (ruby and sapphire) and have historically been confused with each other due to their many similarities. Both minerals are hard, yield durable gems, and form in a range of colors.The major sources of spinel gemstones are Burma, Sri Lanka, and Thailand.
2.02ct Demantoid Garnet
Gem quality sphalerite is a rare collector stone. The mineral is usually nearly black in color but is occaisionally found in transparent pieces of an orange or yellowish brown hue. Clean pieces are extremely rare. More @ www.multicolour.com and #gemstones
"Light of the Desert", the world's largest faceted Cerussite gem (898 carats), Royal Ontario Museum. Cerussite is one of the only gems with adamantine (diamond-like) luster.
43.86ct California Kunzite, Oceanview Mine, Big Kahuna Zone approx late 2010 (3rd gemstone from an unique bi-color crystal!)
This football-shaped blue topaz gem from Minas Gerais, Brazil, weighs 7,033 carats.
Peacock Tourmaline heart weighing 8.10cts from Tunduru, Ruvuma, Tanzania . At Multicolour.com we are usually quite specific about which variety of tourmaline we are referring to. Tourmaline is the family name which includes the following varieties; chrome (green), indicolite (blue), rubelite (red), dravite (brown), achroite (colorless), and siberite (reddish-violet). Yellow and green tourmalines are simply called tourmaline with the color as a prefix. More @ www.multicolour.com and #gemstone...
Natural Spinel step cut heart, 3.9cts. This is apparently a blue spinel.
Gems:Faceted, Exceptional Gemstone: Tsavorite Garnet - 16.88 Ct.. Komolo Mine,20 Km South of Komolo Village, Lelatema Mts, Simanjiro D...
Extremely rare gemstone, member of the taaffeite family - Musgravite eye clean pear weighing 3.69 cts, from Tanzania.
Strong color change Brazilian #Alexandrite oval weighing 0.53 cts
Pure spinel is colorless, but impurities give rise to a range of colors, most typically pink or red, but also purple, green and blue. Spinel is a magnesium aluminum oxide and forms when impure limestone is altered by heat and pressure. They are commonly found in occurrence with corundum (ruby and sapphire) and have historically been confused with each other due to their many similarities.