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This one-of-a-kind tourmaline is exclusively available for a custom piece by Nangi Fine Jewelry. Carefully sourced for its exceptional color and character, the gemstone is selected to become part of a future heirloom, designed together with you.
To begin your custom journey and receive a non-binding proposal, use the button below to access our Ring Designer.
Looking for inspiration? Explore our Custom Lookbook to discover previous one-of-a-kind creations handcrafted around unique gemstones from our collection.
As every gemstone is entirely unique, only one piece is available.
Details
Ethics & certifications
All our gemstones are ethically sourced from trusted small-scale miners and suppliers, primarily in Sri Lanka. Each gemstone is carefully hand-selected for its individual colour, character and natural beauty.
All Nangi custom pieces include a gemstone certificate validating the gemstone's authenticity.
Tourmaline
Tourmaline is celebrated for its extraordinary diversity of color, displaying one of the widest color ranges of any gemstone. From delicate pink and vivid red to green, blue, yellow, and deep violet, its remarkable palette makes each tourmaline distinctly individual. Some gemstones even reveal two or more colors within a single crystal.
Color is the defining characteristic of tourmaline. Its many hues are created by subtle variations in chemical composition, while the intensity, tone, clarity, and cut all contribute to the character and beauty of the individual gemstone. At Nangi, we select tourmalines for their distinctive color, proportions, and overall visual beauty.
With a hardness of 7–7.5 on the Mohs scale, tourmaline is well suited to fine jewelry and can be enjoyed for years when treated with appropriate care.
The name tourmaline derives from the Sinhalese toramalli, referring to mixed or multicolored gemstones. Its extraordinary range of colors also meant that tourmaline was historically mistaken for other precious gemstones. Green tourmalines were once believed to be emeralds, while red varieties were confused with rubies until advances in mineralogy revealed their true identity.
RING SIZE GUIDE
Find Your Perfect Ring Size
| Diameter (mm) | EU | US & Canada | UK / Australia | Switzerland | Singapore / Japan |
| 14.1 | 44 | 3 | F 1/2 | 4 | 4 |
| 14.3 | 45 | G | 5 1/4 | 5 | |
| 14.5 | 3.5 | G 1/2 | |||
| 14.7 | 46 | H | 6 1/2 | 6 | |
| 14.9 | 47 | 4 | H 1/2 | 7 | |
| 15.1 | I | 7 3/4 | |||
| 15.3 | 48 | 4.5 | I 1/2 | 8 | |
| 15.5 | J | 9 | |||
| 15.7 | 49 | 5 | J 1/2 | 9 | |
| 15.9 | 50 | K | 10 | ||
| 16.1 | 5.5 | K 1/2 | 10 | ||
| 16.3 | 51 | L | 11 3/4 | ||
| 16.5 | 52 | 6 | L 1/2 | 12 3/4 | 11 |
| 16.7 | M | 12 | |||
| 16.9 | 53 | 6.5 | M 1/2 | 14 | 13 |
| 17.1 | N | ||||
| 17.3 | 54 | 7 | N 1/2 | 15 1/4 | 14 |
| 17.5 | 55 | O | |||
| 17.7 | 7.5 | O 1/2 | 16 1/2 | 15 | |
| 17.9 | 56 | P | |||
| 18.1 | 57 | 8 | P 1/2 | 17 3/4 | 16 |
| 18.2 | |||||
| 18.3 | Q | ||||
| 18.5 | 58 | 8.5 | Q 1/2 | 17 | |
| 18.8 | 59 | R | 19 | ||
| 19.0 | 9 | R 1/2 | 18 | ||
| 19.2 | 60 | S | 20 1/4 | ||
| 19.4 | 61 | 9.5 | S 1/2 | 19 | |
| 19.6 | T | 21 1/2 | |||
| 19.8 | 62 | 10 | T 1/2 | 20 | |
| 20.0 | U | 21 | |||
| 20.2 | 63 | 10.5 | U 1/2 | 22 3/4 | 22 |
| 20.4 | 64 | V | |||
| 20.6 | 11 | V 1/2 | 23 | ||
| 20.8 | 65 | W | 25 | ||
| 21.0 | 66 | 11.5 | W 1/2 | 24 | |
| 21.2 | X | ||||
| 21.4 | 67 | 12 | X 1/2 | 27 1/2 | 25 |
| 21.6 | Y | ||||
| 21.8 | 68 | 12.5 | Z | 28 3/4 | 26 |
| 22.0 | 69 | Z 1/2 | |||
| 22.2 | 70 | 13 | 27 | ||
| 22.4 | Z+1 |
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The House of Nangi
Halvdan Svartes Gate 3 | Oslo, Norway
Thursday | 11:00-18:00
Monday - Sunday |
by appointment
Norsk side
Nangi Fine Jewelry © 2026