Gem stones

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Across
  1. 3. this stone can be found in many different shades of blue
  2. 4. this gem stone is found in many different colours even clear
  3. 5. this stone is shaped as a circle
Down
  1. 1. a ________ is a blue stone with black colored 'veins' called matrix
  2. 2. ________ is a hardened sap from prehistoric pine trees
  3. 6. the ________ stone has a special powers