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The Concept Map you are trying to access has information related to:
Chapter 2 Section 3 (part 2), durability (hardness) for decoration, metals that are separated by smelting, gemstones that are cut and polished to obtain gems, gems that are valuable due to their durability (hardness), color for decoration, metals that can be mixed to prepare alloys, color for jewelry, durability (hardness) for jewelry, gems that are valuable due to their color, luster for decoration