Where is Sapphire (Tumbled) found?
Corundum
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Open the appSapphire (Tumbled) 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 Sapphire (Tumbled)
Sri Lanka (Ceylon)
Renowned for a wide range of sapphire colors, including the famous 'Padparadscha' (pinkish-orange) and fine blues. Found in alluvial deposits.
Myanmar (Burma)
Produces high-quality blue sapphires, often with a rich, velvety color. Found in metamorphic marbles and alluvial deposits.
Kashmir, India
Historically famous for its rare and highly prized 'cornflower blue' sapphires, known for their intense, velvety blue color. Found in pegmatites and alluvial deposits.
Thailand
Known for dark blue and black star sapphires, often found in basaltic host rocks and alluvial placers.
Australia
A major producer of blue, green, and yellow sapphires, primarily from basaltic sources and associated alluvial deposits.
Madagascar
A significant source of various sapphire colors, including fine blues, pinks, and yellows, from both primary and secondary deposits.
Montana, USA
Produces a range of colors, including blue, green, and fancy sapphires, often from lamprophyre dikes and alluvial deposits (e.g., Yogo Gulch, Rock Creek).
East Africa (Tanzania, Kenya)
Sources of various sapphire colors, including blue, pink, and yellow, often associated with metamorphic terrains and alluvial placers.
Collecting tips
- Source from Reputable Dealers. For tumbled sapphires, purchase from reputable gem and mineral dealers to ensure authenticity and quality. Be wary of unusually low prices, which might indicate synthetic material or misidentification.
- Examine Color and Clarity. Look for vibrant, even coloration. While tumbled stones are not typically facet-grade, good clarity (minimal inclusions) is desirable. Some inclusions, like rutile needles, can cause asterism (star effect) in cabochons, but are less common in small tumbled pieces.
- Check for Luster and Polish. A well-tumbled sapphire should have a smooth, highly polished surface with a vitreous to adamantine luster. Avoid pieces with dull spots, pits, or rough areas, which indicate poor tumbling.
- Consider Specific Gravity. If you have access to equipment, sapphire's relatively high specific gravity (3.95-4.03) can help distinguish it from lighter imitations. This is a more advanced identification method.
- Hardness Test (with caution). Sapphire is very hard (9 on Mohs scale). It will scratch quartz (7) and topaz (8). Only perform this test on an inconspicuous area or a sacrificial piece, as it will damage softer materials. This is a definitive test for corundum.
Quick Check
- Color:
- Blue, pink, yellow, green, purple, orange, black, colorless (often with color zoning)
- Luster:
- Vitreous to adamantine (on polished surfaces)
- Streak:
- White
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