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2. Jewels of Diana, Princess of Wales - Wikipedia

   en.wikipedia.org/wiki/Jewels_of_Diana,_Princess...

   The Aquamarine ring, an emerald cut aquamarine flanked by small, solitaire diamonds and set in 24-carat yellow gold, was commissioned by the Princess from Asprey in 1997 and was used by the Princess as a replacement for her engagement ring after her divorce from the Prince of Wales in 1996. [70]

3. Princess cut - Wikipedia

   en.wikipedia.org/wiki/Princess_cut

   Princess cut diamond set in a ring. The princess cut (technical name 'square modified brilliant') is a diamond cut shape often used in engagement rings. The name dates back to the 1960s, while the princess cut as it exists was created by Betazel Ambar, Ygal Perlman, and Israel Itzkowitz in 1980.

4. Engagement ring - Wikipedia

   en.wikipedia.org/wiki/Engagement_ring

   Three-stone diamond engagement rings, sometimes called trinity rings or trilogy rings, are rings with three matching diamonds set horizontally in a row with the bigger stone placed in the center. The three diamonds on the ring are typically said to represent the couple's past, present, and future, but other people give religious significance to ...

5. Garnet - Wikipedia

   en.wikipedia.org/wiki/Garnet

   For gem identification purposes, a pick-up response to a strong neodymium magnet separates garnet from all other natural transparent gemstones commonly used in the jewelry trade. Magnetic susceptibility measurements in conjunction with refractive index can be used to distinguish garnet species and varieties, and determine the composition of ...

6. Andradite - Wikipedia

   en.wikipedia.org/wiki/Andradite

   Andradite is a mineral species of the garnet group.It is a nesosilicate, with formula Ca 3 Fe 2 Si 3 O 12.. Andradite includes three varieties: Colophonite: a historical variety found in the Scandinavian islands, brownish or reddish in color, often opaque or translucent.

7. Demantoid - Wikipedia

   en.wikipedia.org/wiki/Demantoid

   Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.