Digging Sapphires in Tanzania: Tips from the Field
- Kim Rix
- 2 days ago
- 4 min read
I’m excited to be joining the next gemstone adventure in Tanzania with Hubert and Noreen Noreen in July 2026. Last year, 12 intrepid travellers, including jewellers, gemmologists, and geology enthusiasts, explored some of the most remote sapphire and garnet mining areas I’ve ever seen. I can’t wait to experience it all again and share the insights along the way.
Planning Your Gemstone Mining Adventure in Tanzania
Our journey will start with a long drive from Dar es Salaam to Umba, north of Tanga. We’ll spend five days digging for sapphires, each of us employing local miners, rotating between local men, women, and Masai teams. I plan to have four miners working for me, which will give me a chance to observe their methods and learn from their incredible expertise.
You might think having others do the heavy digging sounds lazy, but it’s completely ethical and necessary. The miners’ income supports their families, and their experience is invaluable. Their stamina is phenomenal...they can dig a hundred times faster than I ever could! I’ll wait until the stones are ready to be sorted before stepping in myself.
Digging for Sapphires Tanzania: How to Spot Raw Sapphires and Garnets
Most of us are familiar with sapphires from jewellery, Kate, Princess of Wales, famously wears Diana’s 12-carat cornflower-blue sapphire, and Princess Eugenie’s engagement ring features a delicate peach-coloured padparadscha sapphire. But would I recognise a raw sapphire before it’s cut and polished? That’s the skill that comes with experience, and it’s something I am still mastering myself.
Tips for Spotting Raw Sapphires:
Look for colour cues: Raw sapphires range from deep blues to lighter cornflower shades, and can also appear pink or violet. Light often reflects differently off uncut stones, so tilt and observe under natural sunlight.
Check the shape and texture: Rough sapphires usually have a hexagonal crystal shape, often with sharp edges or facets that glint under light. Rounded stones are less likely to be sapphires.
Weight and density: Sapphires feel heavier than most surrounding rock of the same size, a subtle clue that comes with handling more stones.
Look beyond colour: Some sapphires appear dark or dull at first. Compare stones next to each other; the right ones usually “stand out” due to translucency or subtle sparkle.
Tips for Spotting Garnets:
Focus on colour and clarity: Rhodolite garnets are typically raspberry-red to purplish-red, while Malaya garnets can appear pinkish-orange. Bright, vibrant colours are usually easier to identify.
Surface and reflection: Garnets often have a glassy sheen, even when rough. A quick wash of dirt or sand often reveals their true colour.
Use a hand lens if possible: Magnifying helps spot inclusions or clarity differences that indicate gemstone quality.
When digging for Sapphires and garnets in Tanzania, it isn’t just about luck; it’s about patience, observation, and learning from the miners. On my previous trip, I found that working closely with experienced locals was the best way to train my eye, and I’m excited to continue honing this skill on the next tour.
Maximising Your Mining Experience in Tanzania
Employing extra miners is the strategy I plan to stick with. On a previous trip, I eventually collected 50 to 60 garnets, black tourmaline, and a variety of sapphires (none transparent or of gem quality), but the experience taught me just how difficult it is to find truly high-quality gemstones. For the next adventure, I’ll apply everything I’ve learned to increase my chances of spotting something exceptional.
You'll have several opportunities to buy gemstones from miners and traders too, so check out my gemstone buying FAQ before you travel.
Visual Highlights: Miners in Action
I’ll be capturing plenty of photos of the miners hard at work, digging on our behalf, and will share them throughout the trip. Seeing the process up close is not just fascinating, it’s a lesson in patience, respect, and the incredible skill behind gemstone mining.
Closing Thoughts: Want to dig for Sapphires with us?
If you’re considering a gemstone adventure, remember that understanding the local mining process, respecting the miners’ expertise, and having the right team with you makes all the difference. I’m looking forward to sharing insights and discoveries from our next Tanzanian tour, where the hunt for rare sapphires and garnets continues!
