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Gemstones
Precious, semi-precious, rare collector stones and organic gems such as pearl and amber.
Rare & Collector
Alexandrite
Chrysoberyl · Hardness 8.5 Extremely Rare Semi-Precious
Citrine
Quartz · Hardness 7 Common Precious
Diamond
Diamond (carbon) · Hardness 10 Uncommon Precious
Emerald
Beryl · Hardness 7.5–8 Rare Semi-Precious
Opal
Opal (hydrated silica) · Hardness 5.5–6.5 Uncommon Organic
Pearl
Aragonite and conchiolin (nacre) · Hardness 2.5–4.5 Uncommon Precious
Ruby
Corundum · Hardness 9 Rare Precious
Sapphire
Corundum · Hardness 9 Rare Semi-Precious
Tanzanite
Zoisite · Hardness 6–7 Rare Semi-Precious