TINCH JOURNAL

Luxury Jewellery Education

Engagement Rings • Mangalsutra • Lab Diamonds • Natural Diamonds • Gemstones • Buying Guides

Vivid green natural gemstone ring in gold

Chrome Tourmaline: A Buyer's Guide

Chrome tourmaline explained — why chromium colouring separates it from ordinary green tourmaline, the Umba Valley source, and how it compares to tsavorite and emerald.

Chrome Tourmaline: A Buyer's Guide

Chrome tourmaline explained — why chromium colouring separates it from ordinary green tourmaline, the Umba Valley source, and how it compares to tsavorite and emerald.

Natural indigolite blue tourmaline loose gemstone

Indigolite (Blue Tourmaline): A Buyer's Guide

Indigolite blue tourmaline explained — pleochroism and why orientation determines everything, heating, how it compares to blue sapphire, and how we source stones worldwide.

Indigolite (Blue Tourmaline): A Buyer's Guide

Indigolite blue tourmaline explained — pleochroism and why orientation determines everything, heating, how it compares to blue sapphire, and how we source stones worldwide.

Natural pink tourmaline loose gemstone

Pink Tourmaline & Rubellite: A Buyer's Guide

Pink tourmaline and rubellite explained — the artificial-light test that separates them, why rubellite is included, irradiation and fracture filling, and how we source stones worldwide.

Pink Tourmaline & Rubellite: A Buyer's Guide

Pink tourmaline and rubellite explained — the artificial-light test that separates them, why rubellite is included, irradiation and fracture filling, and how we source stones worldwide.

Natural red spinel loose gemstone

Red Spinel: A Buyer's Guide

Red spinel explained — the crown jewels mistaken for ruby, Burmese vs Mahenge material, why it is almost never treated, and how it compares to ruby for a daily-wear ring.

Red Spinel: A Buyer's Guide

Red spinel explained — the crown jewels mistaken for ruby, Burmese vs Mahenge material, why it is almost never treated, and how it compares to ruby for a daily-wear ring.

Graduated natural sapphires in rainbow colours

Rainbow Sapphire: A Buyer's Guide

Rainbow sapphire explained — why sapphire is the only species covering the full spectrum naturally, rainbow vs ombré vs parti, why matching drives cost, and how we source parcels worldwide.

Rainbow Sapphire: A Buyer's Guide

Rainbow sapphire explained — why sapphire is the only species covering the full spectrum naturally, rainbow vs ombré vs parti, why matching drives cost, and how we source parcels worldwide.

Natural spinel loose gemstone

Spinel: A Buyer's Guide

Spinel explained — the crown jewels mistaken for ruby, cobalt blue from Luc Yen, why it is almost never treated, and how we source certified natural stones worldwide.

Spinel: A Buyer's Guide

Spinel explained — the crown jewels mistaken for ruby, cobalt blue from Luc Yen, why it is almost never treated, and how we source certified natural stones worldwide.