At The Winter House, 100% of our metals used are recycled. We source our metals from our long trusted, London based casting foundry and Cooksongold, a supplier who is a certified member of the Responsible Jewellery Council. All off-cuts, old pieces and early design trials are melted down and cast into our new work. Using recycled metal ensures our pieces embody a significantly lighter carbon footprint than jewellery crafted from mined metals.

Every piece of jewellery is hallmarked by the Goldsmiths’ Company Assay Office in London, the birthplace of hallmarking for over 700 years. This legally required process verifies the purity of our precious metals, protecting our clients and ensuring complete trust in the authenticity of each piece. A hallmark is more than a stamp, it is a centuries-old promise of quality, integrity, and enduring craftsmanship.

At The Winter House, we offer lab-grown gemstones as an ethical alternative to mined stones. Physically, chemically, and visually identical to natural gems, they require fewer resources, use less energy, and produce lower emissions, helping us work towards our goal of more sustainable practices. 

When we work with natural stones, we work exclusively with conflict-free gemstones, cut and processed in controlled environments where modern equipment and fair employment standards are the norm. We source only from trusted workshops and factories our partners have visited, ensuring stones are handled responsibly and without exploitation. Because the greater ethical challenges often lie in mining itself, we carefully select suppliers who prioritise both people and the environment, whether small-scale artisanal diggers or larger operations required to restore the land. This vigilance allows every gemstone we use to be worn with confidence in an ethically conscious supply chain.