Zostma is an Australian jewellery brand based in Melbourne, created to inspire confidence and elegance in everyday life. We believe fine jewellery shouldn't be reserved for special occasions alone — our pieces are designed to be worn daily, layered for celebrations, and cherished for years to come. Every design reflects a commitment to quality, craftsmanship, and timeless style, made with the Australian woman in mind.

We'd love to hear from you. You can reach our team through our Contact page, or email us directly at info@zostma.com. We aim to respond to all enquiries as quickly as possible and are always happy to help with sizing, orders, or any questions about your pieces.

At Zostma, every piece is crafted using premium materials selected for their quality and longevity:

18k Gold Vermeil — a genuine sterling silver base plated with a substantial layer of 18k gold, offering the rich, warm tone of fine gold jewellery with far greater durability than standard gold plating.

14k Gold Filled — a thick layer of 14k gold that is mechanically bonded to a base metal core, providing exceptional resistance to tarnishing and fading, even with regular wear.

925 Sterling Silver — 92.5% pure silver alloyed for strength, offering a bright, timeless finish.

Cubic Zirconia — a brilliant, clear stone prized for its exceptional sparkle and clarity.

Moissanite — a lab created stone celebrated for its fire and brilliance, often compared to diamond.

Each product page lists the exact materials used for that specific piece, so you always know exactly what you're wearing.

Gold vermeil is a genuine sterling silver base (925 silver) plated with a thick layer of gold — a minimum of 2.5 microns and 18k gold purity by industry standard. This substantial layer of gold is what sets vermeil apart from standard gold plating, offering a richer colour, a more substantial feel, and considerably greater durability over time.

All plated jewellery can tarnish over time, particularly with exposure to moisture, perfume, and cosmetic products — this is a natural characteristic of plated pieces, not a fault. With proper care, your jewellery will maintain its finish beautifully for much longer:

— Keep it dry — avoid showering, swimming, and hand washing while wearing it

— Apply perfume, lotion, and other cosmetics before putting your jewellery on

— Store each piece separately in a cool, dry place away from direct sunlight

— Clean gently with a soft, dry polishing cloth

For full care instructions, visit our Care & Cleaning page.

Cubic zirconia is a brilliant, clear stone known for its exceptional sparkle and clarity, offering the look of fine jewellery in a way that's accessible for everyday wear.

Moissanite is a lab created stone celebrated for its fire and brilliance, often compared to diamond for its exceptional sparkle.

925 sterling silver is 92.5% pure silver, alloyed with other metals for strength and durability. It's the industry standard for fine silver jewellery.

You can find your size using the size guide available on the product page under the size selector, or by visiting our Size Guide directly.

Many of our bracelets and necklaces feature an adjustable chain for a customised fit. Check the individual product page for specific sizing details.

Not to worry — reach out to us and we'll help arrange an exchange for the correct size, in line with our Returns & Exchanges policy.

Every Zostma piece is designed to be worn and loved for years to come. To help your jewellery last as long as possible, we recommend the following:

Moisture: Avoid contact with water, including showering, swimming, and hand washing, as this can cause plated jewellery to tarnish over time.

Cosmetics: Perfume, lotion, and other cosmetic products can affect the finish of gold-plated and sterling silver jewellery. Apply these before putting your jewellery on, not after.

Exercise: Remove jewellery before exercising — sweat and friction can wear down plating and delicate pieces may catch or break during activity.

Storage: Store each piece separately in a cool, dry place away from direct sunlight. Avoid long-term storage in humid areas such as bathrooms, and keep pieces away from each other to prevent scratching.

Cleaning: Clean gently using a soft, dry polishing cloth. Avoid harsh chemicals, abrasive materials, or jewellery cleaning solutions not designed for plated pieces.

Plating: As with all plated jewellery, the outer layer will naturally wear over time with regular use — this is expected and not considered a fault.

For more detail, visit our Care & Cleaning page.

Store each piece separately in a soft pouch or lined jewellery box, away from direct sunlight and humidity, to prevent scratching and tarnishing.

Keep jewellery away from perfume, lotion, and water where possible, and put your pieces on last when getting ready. Storing them properly between wears also helps significantly.

Gently clean the piece with a soft cloth and mild soap and water, following our Care & Cleaning guide. If tarnishing persists, get in touch and we're happy to help.

We recommend removing your jewellery before swimming or showering. Chlorine, salt water, and prolonged moisture can affect the plating and shorten its lifespan.

It's best to remove jewellery before exercising. Sweat and friction can wear down plating over time, so taking it off helps your pieces last longer.

Sign up to our Zostma Partnership program here, where you'll be given a custom code offering your followers 10% off their order, while you earn 5% commission on each sale made through your code. You can also use your own code to save on your personal purchases.

Partners earn 5% commission on each sale made through their custom code, and their followers receive 10% off using that same code.

We accept all major credit and debit cards, as well as PayPal.

Please contact us as soon as possible after placing your order. As we aim to process orders quickly, we can only accommodate changes or cancellations before dispatch.

Your piece arrives in a Zostma jewellery box, nestled within our packaging box and wrapped in our signature pattern paper to help keep it secure and prevent movement during transit.

Orders are processed within 1–3 business days of purchase (Monday–Friday, excluding VIC public holidays). Once shipped, you'll receive a tracking email straight away.

Australia

Standard shipping: 2–7 business days — $10 AUD

Express shipping: 1–3 business days — $15 AUD

Free shipping on orders over $200 (standard delivery times)

International

Standard: 5–15 business days — $20 AUD

Express: 2–7 business days — $35 AUD

Delivery times are estimates and may take longer during peak periods like Christmas, Valentine's Day, and Mother's Day — we recommend express shipping if your order is time-sensitive. Full details on our Shipping & Delivery page.

You have 30 calendar days from delivery to return an item, provided it's unused, in its original condition, with proof of purchase. Return shipping is at the customer's cost unless the item is faulty or damaged.

Approved refunds go to your original payment method (typically 5–10 business days for cards, 3–5 for PayPal). Want to exchange instead? We can help with that too, within the same 30-day window, subject to stock availability.

Please note: for hygiene reasons, earrings can only be returned if faulty or damaged on arrival.

If your item arrives faulty or incorrect, contact us within 7 days at info@zostma.com and we'll arrange a replacement, exchange, or full refund at no cost to you.

Full details on our Return Policy page.

Sale items are not eligible for return or refund, unless the item arrives faulty — in which case we'll arrange a replacement or refund in line with our Return Policy.

Yes, every piece comes with a 1 year warranty. Full terms are outlined on our Warranty page.

Our warranty covers manufacturing faults such as clasp or setting defects under normal wear. See our Warranty page for full details.

General wear and tear, tarnishing from lack of care, water exposure, or accidental damage are not covered. Full exclusions are listed on our Warranty page.

Contact our team via info@zostma.com or through our Contact page with your order number and a photo of the piece, and we'll assess your claim and guide you through next steps.