Calculate SG using hydrostatic weighing method
| Gemstone | SG Range |
|---|---|
| 💎 Diamond | 3.52 |
| ❤️ Ruby / 💙 Sapphire | 3.99-4.01 |
| ✨ Alexandrite | 3.73 |
| 🔮 Spinel | 3.60 |
| 💚 Emerald | 2.70-2.78 |
| 🌙 Moonstone | 2.56 |
| 💛 Citrine/Amethyst | 2.65 |
| 💎 Zircon | 4.69 |
Formula: SG = Weight in Air ÷ (Weight in Air - Weight in Water)