Gold purity isn't a marketing detail. It's a structural decision that affects how a ring wears, ages, and holds its engraving over decades. At Fenua Design, every piece starts at 18kt gold, and that floor is deliberate rather than a default.
What the Karat Number Actually Means
Gold in its pure form, 24kt, is too soft for a ring meant to be worn daily; it scratches and deforms easily. Karat purity tells you how much of the metal is gold versus alloy. 14kt gold is about 58% pure gold, while 18kt is 75% pure. That difference shows up in color depth, weight, and how the metal responds over time. 18kt carries a warmer, richer tone straight out of the setting, without needing replating to maintain it.
Why It Matters More for Hand-Engraved Pieces
Hand-engraving cuts into the metal itself, and that detail is only as durable as the metal holding it. Lower-karat gold, with its higher alloy content, can be more brittle and prone to fine cracking around deep engraved lines over years of wear. 18kt gold's higher purity gives it more workability, which matters when a Maile leaf vine or scrollwork lettering is cut by hand into a heirloom-style band. The engraving is meant to outlast the person who commissioned it, and the metal needs to be built for that timeline.
Why We Don't Go Lower
It would be easy to offer a 10kt or 14kt option at a lower price point. We don't, because it would mean asking a customer to choose between an heirloom-quality piece and an accessible one, and that's a trade we're not willing to make on their behalf. Every custom engagement ring we build starts from the same 18kt floor, regardless of the setting or stone chosen around it.
A ring you're planning to hand down shouldn't be built to the minimum standard. It should be built to outlast the occasion it was made for, and that starts with the metal.