Guinevere Necklace in 18K Gold with 29.36ct Amethyst

This 18K gold necklace features a 29.36ct untreated amethyst from Bahia, Brazil, cut by John Dyer & Co. in a Regal Radiant™ Cut, and accented with additional amethysts and approximately 1.165cts of natural diamonds (G color, SI1 clarity). The pendant measures 31 × 46mm and is finished with a 48cm chain plus a 6cm extension. This piece comes with a certificate of authenticity from John Dyer & Co.

All fine jewelry orders are fully insured during transit, with a signature required upon delivery to ensure your piece is safely delivered. If you prefer not to sign for the delivery, please inform me via email at support@pterajewelry.com after placing your order.

Ptera jewels are meticulously crafted by our artisans using the finest gold and silver. We proudly source all our materials ethically, from the metals to the gemstones, ensuring that every piece reflects our commitment to quality and integrity.

To ensure your satisfaction, we accept returns or exchanges for unworn, non-customized fine jewelry within 14 days of delivery.

Please note the following:

• The jewelry must be returned in its original condition, including packaging and certification (if applicable).
• Custom or personalized pieces, including engraved items, are non-refundable and cannot be exchanged.
• Any signs of wear, damage, or alteration will void eligibility for a return or exchange.

To initiate a return, please contact us at support@pterajewelry.com with your order details.

At Ptera, we take great pride in our craftsmanship. We guarantee the quality of our work and will gladly address any issues related to workmanship. However, repairs for damage caused by external factors, improper care, or mishandling beyond Ptera’s control will not be covered under our policy.

Your 18k gold amethyst and diamond necklace is crafted to last a lifetime with proper care. Here are some best practices:

Wear with care – Amethyst is softer than diamond and can scratch or chip with impact. Avoid wearing your necklace during strenuous activities or situations where it may be knocked against hard surfaces. While diamonds are very durable, the setting and chain should still be handled with care.

Keep it away from harsh chemicals – Avoid exposure to household cleaners, chlorine, perfumes, lotions, and sunscreen, as these can damage and dull both the gold and the gemstones. Amethyst in particular can be sensitive to prolonged exposure.

Store it safely – Store your necklace in a soft pouch or its own compartment to prevent scratching, tangling, or contact with other jewelry.

Clean it gently – Use warm water, mild soap, and a soft cloth or very soft brush. Avoid ultrasonic and steam cleaners, as amethyst can be sensitive to heat and sudden temperature changes.

Professional maintenance – Have your necklace inspected and professionally cleaned every 6–12 months to ensure the stones remain secure and everything stays in great condition.