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2. Jet (gemstone) - Wikipedia

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

   Jet has been used in Britain since the Neolithic period [26] It continued in use in Britain through the Bronze Age where it was used for necklace beads. [26] Jet necklaces following the plate and spacer design may have been based on Gold lunula. [27] During the Iron Age jet went out of fashion until the early 3rd century AD in Roman Britain.

3. Agate - Wikipedia

   en.wikipedia.org/wiki/Agate

   Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in Ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...

4. The Rock (diamond) - Wikipedia

   en.wikipedia.org/wiki/The_Rock_(diamond)

   The Rock is a 228.31-carat white diamond which has been graded by the Gemological Institute of America. It has G color, VS1 clarity. [1] The color of white diamonds can range from D to Z: D-color is the highest grade for white diamonds, and it is the rarest and most expensive. The Rock is G-color, which is the fourth whitest level of white ...

5. Necklace - Wikipedia

   en.wikipedia.org/wiki/Necklace

   A necklace is an article of jewellery that is worn around the neck. ... pearl, carnelian, amethyst, and rock crystal. [4] ...

6. Jan Yager - Wikipedia

   en.wikipedia.org/wiki/Jan_Yager

   Rock Necklace, 1984, by Jan Yager. Yager gained national acclaim in the 1980s by combining her uniquely textured pillow-forms of 18k gold and sterling silver with water-polished natural stones, [24] [2] a juxtaposition that shocked some viewers. [25] Many of the rocks and pebbles were collected while she was a student at RISD. [2]

7. Helenite - Wikipedia

   en.wikipedia.org/wiki/Helenite

   Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1] [2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980.