Jewellery & Watch Information

General Costco Jewellery & Watch Information

Jewellery selections may vary by season and availability. Please click here for the most current availability on Costco.com.au. Select jewellery may be available at your local Costco warehouse.

Finished Jewellery

Costco sells finished jewellery. No loose stones or semi-mounts are available.

Costco's jewellery is offered in either 14kt gold, 18kt gold, or 950 platinum. We are unable to customize metal preferences.

Online Orders

Items offered on Costco.com.au are not available for shipment to warehouses for preview prior to purchase. Some items offered on Costco.com.au may also be available in warehouses.

Care and Maintenance

We recommend you have your jewellery inspected every six months by your local qualified jeweler. Everyday wear, changing the size of a ring, or altering a piece of jewellery may result in worn metal and loose or lost gemstones. A professional jeweler can assess the general condition of your jewellery and perform any needed maintenance.

Care and Maintenance

Your jewellery can be cleaned with warm soapy water and a soft brush or cloth.

Care and Maintenance

Do not wear your gold jewellery while using chlorine bleach or using a pool or hot tub.

Care and Maintenance

White gold may wear over time and may need replating to restore whiteness to your jewellery.

Care and Maintenance

Keep your watch away from dust and dirt. Ensure the crown of your watch is closed securely at all times. Water resistance does not mean waterproof. The rubber seals on watches can break down from frequent contact with water.

Insuring Your Jewellery Insuring Your Jewellery

It is important to insure your jewellery in case of loss, theft or damage.

Ethical Sourcing

Costco and our suppliers support the Kimberley Process, a multinational initiative to stem the flow of conflict diamonds, and the World Diamond Council’s System of Warranties, a voluntary system of industry self-regulation that assures buyers of diamond jewellery that the diamonds in the jewellery they have purchased are from legitimate sources and conflict free.

Necklace Length Guide

Use this guide to determine as approximation of where the necklace will fall (may vary by size and height of individual).

Ring Sizing

Women's rings are offered in size 7, men's rings in size 10. Select items are available in additional sizes. Costco does not offer ring sizing.