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  2. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    The ideal grade, called "Deep Siberian", has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues. " Rose de France" is defined by its markedly light shade of the purple , reminiscent of a lavender / lilac shade.

  3. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    Present, dichroism or trichroism, depending on heat treatment. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate ), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a ...

  4. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    Diamonds occur in a variety of colors—steel gray, white, blue, yellow, orange, red, green, pink to purple, brown, and black. [2] [3] Colored diamonds contain interstitial impurities or structural defects that cause the coloration; pure diamonds are perfectly transparent and colorless.

  5. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis armenus – Precious stone resembling lapis lazuli; Sar-i Sang – town in Badakhshan Province, Afghanistan; Shades of blue – Variety of the color blue; Ultramarine – Deep blue purple color pigment which was originally made with ground lapis lazuli; References

  6. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Total carat weight (t.c.w.) is a phrase used to describe the total mass of diamonds or other gemstone in a piece of jewelry, when more than one gemstone is used. Diamond solitaire earrings, for example, are usually quoted in t.c.w. when placed for sale, indicating the mass of the diamonds in both earrings and not each individual diamond.

  7. Blue John (mineral) - Wikipedia

    en.wikipedia.org/wiki/Blue_John_(mineral)

    Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire.