Tanzanite Engagement Rings — Handcrafted in Hatton Garden, London

Few gemstones in the world can rival the extraordinary colour of tanzanite. Its mesmerising blue-violet hue — shifting from deep sapphire blue in daylight to rich violet under incandescent light — is unlike anything else in the gemstone kingdom. Discovered only in 1967 in the foothills of Mount Kilimanjaro in Tanzania, tanzanite is found in a single location on earth, making it approximately 1,000 times rarer than diamond. For those seeking an engagement ring that is truly one of a kind, tanzanite is an exceptional and deeply meaningful choice.

At Finediam, every tanzanite engagement ring in this collection is handcrafted in Hatton Garden, London — the UK’s most prestigious jewellery quarter, with over 300 years of goldsmithing heritage. Each ring is set with carefully selected tanzanites and finished in hallmarked precious metals, certified by the London Assay Office. Whether you are drawn to a classic tanzanite solitaire, a diamond halo design, or a vintage-inspired setting, our collection offers exceptional quality and craftsmanship at every price point.

Why Choose a Tanzanite Engagement Ring?

Tanzanite has become one of the most sought-after coloured gemstones in the UK fine jewellery market — and its appeal is easy to understand. Its extraordinary trichroic nature means it displays three different colours depending on the angle and light source: blue, violet, and burgundy. No two tanzanites look exactly alike, and no other gemstone offers quite the same depth and complexity of colour.

Tanzanite rates 6.5 to 7 on the Mohs hardness scale — softer than sapphire or ruby, but perfectly suitable for an engagement ring when set thoughtfully in a protective setting such as a bezel or halo. With proper care, a tanzanite engagement ring will retain its extraordinary beauty for a lifetime.

Tanzanite is also the birthstone of December, making it a particularly meaningful choice for those born in that month or for December proposals. It symbolises transformation, new beginnings, and the courage to embrace change — qualities that resonate deeply with the commitment of an engagement.

As tanzanite is found in only one location on earth and existing reserves are estimated to be depleted within decades, it is also considered a sound long-term investment — a gemstone whose rarity is only likely to increase over time.

Our Tanzanite Engagement Ring Collection

Finediam’s tanzanite engagement ring collection spans a range of styles, settings, and metals — from understated solitaires to elaborate halo and three-stone designs. All rings are available in your choice of hallmarked precious metals and can be customised to your preferred ring size and specification.

Styles Available:

• Tanzanite Solitaire — a single tanzanite as the centrepiece, allowing the stone’s extraordinary colour to take centre stage; available in four-claw, six-claw, and bezel settings
• Tanzanite Halo Ring — a central tanzanite surrounded by a halo of pavé-set diamonds, amplifying the stone’s brilliance and protecting its edges
• Tanzanite with Diamond Shoulders — a tanzanite centre stone flanked by diamond-set shoulders for a glamorous, three-dimensional effect
• Tanzanite Three-Stone Ring — a tanzanite flanked by two diamonds or gemstones, symbolising the past, present, and future of a relationship
• Vintage-Inspired Tanzanite Ring — intricate milgrain detailing and antique-style settings that complement tanzanite’s rich, regal colour

Browse our full range of engagement rings or explore our gemstone ring collection for further inspiration.

Tanzanite Colour, Grade & Quality

The quality of a tanzanite is primarily determined by its colour — the most prized stones displaying a vivid, deeply saturated blue-violet with strong pleochroism (the ability to show different colours from different angles). The finest tanzanites are graded AAA and display a rich, velvety blue with violet overtones that shift dramatically under different light sources.

At Finediam, we select tanzanites for their colour saturation, clarity, and overall quality. We source only eye-clean stones — meaning inclusions are not visible to the naked eye — and assess each stone individually to ensure it meets our exacting standards before being set into a ring.

Tanzanites are most commonly cut in oval and cushion shapes, which showcase the stone’s pleochroism and depth of colour to best effect. Round brilliant, pear, and emerald cuts are also available, each offering a different character and visual impact.

All tanzanites used in Finediam rings are independently assessed for colour, clarity, cut, and carat weight, ensuring complete transparency and confidence in your purchase.

Metals & Hallmarking

Every tanzanite engagement ring in this collection is crafted in hallmarked precious metals, certified by the London Assay Office — the oldest assay office in the world and the gold standard for precious metal certification in the UK.

• 9K & 18K White Gold — the most popular choice for tanzanite rings; the cool, bright tone of white gold enhances tanzanite’s blue-violet hues beautifully
• 9K & 18K Yellow Gold — a warm, classic metal that creates a striking contrast with tanzanite’s cool tones, evoking a vintage, regal aesthetic
• 9K & 18K Rose Gold — a romantic, blush-toned metal that pairs elegantly with tanzanite’s violet undertones
• 950 Platinum — the most prestigious and durable of all jewellery metals; naturally white, hypoallergenic, and exceptionally long-lasting

White gold and platinum are the most popular choices for tanzanite engagement rings, as their cool tones complement and intensify the stone’s blue-violet colour. For a more distinctive, vintage-inspired look, yellow gold creates a beautiful warm contrast against tanzanite’s rich hues.

Customisation & Bespoke Tanzanite Rings

Every Finediam tanzanite engagement ring can be customised to your exact requirements. Choose your preferred metal, tanzanite size and grade, setting style, and ring size — or work with our Hatton Garden team to create a fully bespoke design from scratch.

Ring size customisation is available on all orders at no additional charge, and our complimentary resizing service ensures your ring will always fit perfectly. For personalised engravings, unique band designs, or one-of-a-kind commissions, please speak to our Hatton Garden team — we work with clients across the UK and worldwide to bring their vision to life.

Why Choose Finediam?

• Hatton Garden, London — handcrafted in the UK’s most prestigious jewellery quarter, with over 300 years of goldsmithing heritage
• Ethically sourced gemstones — independently assessed tanzanites with full provenance transparency
• UK Hallmarked — every piece certified by the London Assay Office, guaranteeing metal purity and craftsmanship
• Free UK delivery — fully tracked and signed for, with discreet, secure packaging
• Free worldwide delivery — insured and signed for, to over 100 countries
• 30-day hassle-free returns — shop with complete confidence
• Free resizing — complimentary ring size adjustments for the lifetime of your ring
• Thousands of verified reviews — trusted by customers across the UK and beyond

Rare. Radiant. Unmistakably Finediam.

Browse the collection below — or speak to our Hatton Garden team for personalised guidance, gemstone selection advice, and bespoke requests.