FAQ

A lab-grown diamond is a real diamond created above ground using advanced technology that replicates the natural process of diamond formation. It has the same crystal structure, hardness, and brilliance as a mined diamond — the only difference is where it came from.

Yes. Lab-grown diamonds are chemically, physically, and optically identical to mined diamonds. The only way to tell them apart is with specialised equipment used by gemological laboratories — to the naked eye, and even under a jeweller’s loupe, they’re the same.

Certification varies by product and stone. The product page states the grading laboratory and the stones covered where confirmed. Accent diamonds are not individually certified unless the listing specifically says they are. Contact us if you need report details for a particular piece.

Lab-grown diamonds offer the brilliance and physical properties of diamonds in jewellery designed in Melbourne, Australia. Our stones are sourced only from ethical sources and can be traced back to their source. Read more on our Our Promise page.

Our size guide covers two easy ways to measure at home, plus a conversion chart between Australian, US, and UK sizing. If you’re between sizes, we recommend sizing up.

In most cases, yes — email us at customercare@oscarandco.com.au with your order details and we’ll advise on resizing options for your specific piece. Rings with certain eternity or pavé settings can be harder to resize, so it’s worth checking before you order if you expect your size to change.

We offer 9K, 14K, 18K, and 22K gold in yellow, white, and rose tones, as well as platinum and silver. Available options vary by piece — check the product page for what’s offered on a specific design.

Our full product care guide covers cleaning and storage for diamonds, gold, platinum, and silver. As a general rule: take jewellery off before swimming, exercising, or using cleaning products, and store pieces separately to avoid scratching.

Yes. We recommend a professional inspection of settings and clasps once a year. Annual inspections are recommended, not a condition of our lifetime workmanship warranty. Normal wear and routine maintenance are excluded from this voluntary cover. Your Australian Consumer Law rights are unaffected.

Yes — DHL Express ships free on orders over $150 anywhere in Australia (Australia Post is also available for a flat $15). Every order is fully insured either way. See our shipping page for dispatch timeframes and tracking details.

Not at the moment — we currently ship within Australia only. If that changes, we’ll update this page.

We offer 30-day change-of-mind returns on eligible unworn, unaltered pieces in their original packaging. Made-to-order, engraved and resized pieces are excluded from change-of-mind returns. Customers pay return postage for change-of-mind returns. These conditions do not limit your rights for faulty or misdescribed goods under the Australian Consumer Law. Full details are on our returns page.

Yes — all payments are processed through encrypted, PCI-compliant checkout. We never store your full card details on our servers.

Our lifetime workmanship warranty covers manufacturing defects for as long as you own the piece, such as a faulty setting or clasp. Normal wear, routine maintenance, accidental damage, loss or theft of the jewellery, and damage caused by another jeweller’s work are excluded from this voluntary cover. Unrelated manufacturing defects remain covered. See Our Promise for the full coverage, claim process and postage arrangements. Your Australian Consumer Law rights are unaffected.

Email customercare@oscarandco.com.au and our team will get back to you, usually within 1 business day. See our Contact page for details.