Ruby.

Ruby is the red variety of corundum, the same mineral species as sapphire. Trace chromium replaces a small fraction of the aluminium in the lattice and produces the strong red, often with a faint internal fluorescence that lifts the colour in daylight. At hardness nine it is the second hardest natural mineral after diamond, which is part of why ruby has held its place in everyday jewellery for so many centuries.

The Mogok valley in Myanmar produced the historical benchmark for fine ruby, the so-called pigeon-blood material with strong colour and gentle fluorescence. Mozambican deposits opened more recently have become the dominant source for the broader trade, with cleaner clarity and slightly different colour temperature. Heat treatment to improve colour and reduce silk inclusions is standard practice and should be disclosed.

Across cultures ruby has carried the meaning of vital fire. Sanskrit texts called it ratnaraj, king of gems. European medieval lapidaries placed it on rulers and warriors. The modern crystal tradition continues that thread, pairing ruby with the root and heart chakras and treating it as a stone of warm presence rather than aggression. It is the piece people reach for when energy has gone flat and the body needs reminding of its own steadiness. A ruby is durable enough for daily wear and holds polish indefinitely with reasonable care.