Where is Yellow Gemstone found?
Unidentifiable (likely Citrine, Yellow Sapphire, or Cubic Zirconia)
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Open the appYellow Gemstone occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Yellow Gemstone
Brazil
Major source of natural citrine, particularly from the state of Rio Grande do Sul. Also a source of amethyst which is often heat-treated to produce citrine.
Sri Lanka (Ceylon)
Historically and currently a significant source of high-quality yellow sapphire, often found in alluvial deposits.
Madagascar
Produces various colors of sapphire, including yellow, from both primary and secondary deposits.
Australia
Known for its sapphire deposits, including some yellow varieties, particularly in Queensland and New South Wales.
Africa (various countries)
Several African nations, including Tanzania and Kenya, produce yellow sapphire. Namibia and Zambia are known for citrine.
Laboratories Worldwide
Cubic Zirconia is produced globally in industrial laboratories using various growth methods (e.g., skull melting).
Collecting tips
- Hardness Test. A scratch test can differentiate between these materials. Citrine (Mohs 7) will scratch glass but not sapphire. Yellow Sapphire (Mohs 9) will scratch citrine and glass. Cubic Zirconia (Mohs 8-8.5) will scratch citrine but not sapphire, and will scratch glass.
- Refractive Index (RI) and Specific Gravity (SG). These are definitive tests for gemologists. Citrine: RI ~1.54-1.55, SG ~2.65. Yellow Sapphire: RI ~1.76-1.77, SG ~4.00. Cubic Zirconia: RI ~2.15-2.18, SG ~5.6-6.0. These differences are significant and measurable with standard gemological equipment.
- Inclusions and Growth Patterns. Natural gemstones often contain characteristic inclusions (e.g., two-phase inclusions in citrine, rutile needles in sapphire). Cubic Zirconia is typically flawless or may show gas bubbles or curved growth lines under magnification.
- Pleochroism. Yellow Sapphire is dichroic (shows different colors when viewed from different angles), while citrine and cubic zirconia are not (or very weakly in citrine). This can be observed with a dichroscope.
- Fluorescence. Some yellow sapphires may fluoresce orange or yellow under UV light, while citrine typically does not. Cubic Zirconia can show various reactions depending on dopants.
Quick Check
- Color:
- Yellow to orange-yellow
- Luster:
- Vitreous to sub-adamantine
- Streak:
- White (for all three)
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