🔬 THE DECISION TREE (Simple & Accurate)

1. Does it show Schreger lines in cross-section?

• ✅ Yes → Proboscidean ivory

• ❌ No → Not elephant/mammoth

2. If Schreger lines present:

• Acute angles → Elephant

• Obtuse angles → Mammoth

3. No Schreger lines?

• Spongy interior → Antler

• Circular pores → Bone

• Uniform plastic → Fake

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⚖️ Legal Reality (Important)

• “Real ivory” � legal ivory

• Mammoth ivory is real but often legal

• Elephant ivory is real but usually illegal

• Bone/antler may be legal but cannot be labeled ivory

Mislabeling = fraud, regardless of origin.

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� One-Line Truth

Ivory is dentin from tusks or teeth—everything else is either bone, horn, antler, or plastic, no matter how convincing it looks.

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Source: OpenAI