Field Notes 1.3 — The Valley's Palette
The stone is always where a piece begins. Before the sketch, before anything else — there is a colour. A photograph, a reference or simply how the colour makes you feel: I want something that reminds me of the water in the Maldives.
A padparadscha sapphire carries a pink-orange that reminds me, every time, of sunsets by the beach. A pigeon blood ruby reminds me of the roses my husband once gave me: something given because words were not enough. Colour in gemstones is not decorative. It is why the stone was chosen.
At Gǔ, coloured gemstones are The Valley's Palette — chosen for what they carry, not just what the certificate says. Two stones with identical certificates can read entirely differently in the hand. One is alive. One is merely correct.
What follows is a guide to the stones the Atelier works with most.
Sapphire. Mohs 9
Its range: blue, pink, yellow, orange, green, purple, black and white
Comes from: Sri Lanka, Burma, Madagascar, Australia
Rarest of all: Padparadscha, a precise pink-orange found almost nowhere else in nature.
The most versatile stone in the Palette. The blue is what most people know but it comes in nearly every colour. At 9 on the Mohs scale, second only to diamond, it is one of the few coloured stones built for a ring worn every day.
A special mention to the colour change variety — shifting between two distinct
colours depending on the light source — shifts from blue in daylight to violet by candlelight.
Ruby. Mohs 9
Its range: red — from the softest pink-red to the deepest vivid scarlet
Rarest of all: Pigeon blood, a rich saturated red with a warmth that reads as alive
Comes from: Burma, Mozambique, Thailand, Sri Lanka
Red is its only colour, but the range within red is wide — and the difference between a fine ruby and an ordinary one is immediately felt. The same hardness as sapphire, and built the same way: for a ring worn through everything, across decades.
Emerald. Mohs 7.5–8
Its range: green — from light and bright to deep, sometimes with a blue undertone
Rarest of all: Muzo green — blue-green coloured emeralds from the Muzo mine
Comes from: Colombia, Zambia, Brazil, Zimbabwe
Inclusions are expected in emerald and are called jardin: the garden. They are not flaws. They are the record of how the stone formed, and a natural emerald without them is exceptionally rare. Suits pieces worn with care; its character and its vulnerability come from the same place.
Tourmaline. Mohs 7–7.5
Its range: green, pink, red, blue, bi-colour, watermelon (pink and green)
Comes from: Brazil, Nigeria, Mozambique, Afghanistan
Rarest of all: Paraiba, an electric blue-green found in only a handful of deposits worldwide
No stone comes in more colours. The paraiba is the rarest of them: a vivid blue-green unlike anything else in the Palette, immediately recognisable. Durable, but benefits from care — better suited to pieces removed at the end of the day than rings worn through everything.
Tanzanite. Mohs 6.5–7
Its range: blue-violet, violet, purple — and shifts between them depending on the light
Comes from: Tanzania (the foothills of Kilimanjaro — the only source in the world)
Its quality of changing colour in different light — from blue to violet in the same stone — is what makes it distinctive. Found nowhere else on earth, which is part of what it carries. Best suited to earrings, pendants, and pieces worn with intention rather than rings worn daily.
Spinel. Mohs 8
Its range: red, pink, orange, blue, violet, lavender
Comes from: Burma, Sri Lanka, Tanzania, Vietnam
Rarest of all: Jedi spinel — a vivid neon pink-red from the Mogok mines of Burma
The stone most often mistaken for something else. Some of the most celebrated rubies in history — including stones in royal collections — are spinel. Almost always unenhanced, with a brilliance that rewards close attention. Undervalued relative to its quality, and increasingly recognised by those who know what they are looking at.
Our stones are sourced across a trusted network of suppliers — conflict-free, ethically sourced, hand-selected — and chosen for character.
When a client brings a colour — a photograph,
a memory, a feeling — that is where the stone search begins.
The right one is rarely the first one found.
But when it arrives, it is immediately known.
From the Valley,
