Gemstones

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Across
  1. 3. It can be a variety of colours from pink, green, purple, yellow or clear
  2. 6. It can be a different shades of blue
Down
  1. 1. It is a hardened sap from prehistoric pine trees
  2. 2. It has black veins called matrix
  3. 4. It is created inside a mollusk or oyster
  4. 5. It is believed in Greece to keep houses from storms