Once you've chosen your diamond, the next decision is the metal. For most engagement rings in Australia, the choice comes down to 18K yellow gold, 18K white gold, 18K rose gold, or platinum. Each has distinct characteristics in appearance, durability, maintenance, and price.
18K yellow gold
18K yellow gold is 75% pure gold, alloyed for durability. It's the traditional choice and has seen a major resurgence in popularity — particularly with oval, emerald, and solitaire settings, where the warm tone creates a beautiful contrast with a white diamond.
Pros: Timeless aesthetic; doesn't require replating; develops a warm patina over time. Cons: Can show scratches more than platinum.
18K white gold
Alloyed with white metals and rhodium-plated to achieve a bright white finish. The most popular choice in Australia for the last two decades, though yellow gold is closing the gap fast.
Pros: Clean, bright appearance; maximises diamond sparkle; less expensive than platinum. Cons: Rhodium plating wears off over time (typically every 1–3 years) and requires replating to maintain the white finish.
18K rose gold
Gets its warm pink tone from a higher copper content. Romantic, distinctive, and ages gracefully.
Pros: Unique warm aesthetic; harder than yellow or white 18K gold; doesn't require replating. Cons: Not suitable for copper sensitivities.
Platinum
A naturally white metal, denser and more durable than gold. The premium choice for engagement rings.
Pros: Naturally white — no replating ever; the most durable metal; hypoallergenic. Cons: 15–25% more expensive than gold; heavier on the finger.
Which should you choose?
Warm, romantic, low-maintenance: 18K yellow gold. Bright classic white at a lower price: 18K white gold (with replating). Something distinctive and warm: rose gold. Most durable, naturally white, premium: platinum.
All Una Diamond rings are available in 18K yellow gold, 18K white gold, rose gold, and platinum. Book a free styling consult if you're unsure which to choose.
See Una Diamond's Pricing
Every Una Diamond ring is made to order in solid 18K gold or platinum with an IGI-certified lab-grown diamond. Prices start from around $3,000 AUD:
- The Georgina — oval-cut solitaire from $6,100 AUD
- The Celina — emerald-cut from $6,100 AUD
- Browse all rings and prices →