5 mm Black Diamond Unisex Tennis Necklace

Make a statement with this black diamond tennis necklace from ZeeDiamonds. Approximately 5 mm round brilliant-cut diamonds create a rich jet-black appearance with light-catching surface reflections, complemented by stamped solid 925 sterling silver metal.

The 18-inch necklace has an approximate total diamond weight of 70 carats. Choose from White Gold, Rose Gold, Black Gold, or Yellow Gold finish options to suit your style.

Designed for men and women, this unisex tennis necklace can be worn on its own or paired with your favorite jewelry. It also makes a thoughtful gift for an anniversary, birthday, or Christmas.

Product Details

Diamonds Color - Jet Black
Shape - Round Brilliant Cut
Approx. Size of Round Diamonds - 5 mm
Approx. Weight of the Diamonds - 70 Carat For 18 Inches
Origin - Central Africa ( Conflict Free )
Species - Carbonado - Earth Mined
Clarity - Opaque
Quality - AAA
Cut - Excellent
Metal - Stamped Solid in 925 Sterling Silver
Finish - White Gold, Rose Gold, Black Gold, Yellow Gold (option below)

Special Offer: Free Diamond Solitaire Studs

Diamond Treatment Disclosure

The diamonds are described as earth-mined and treated using high pressure and high temperature (HPHT) to enhance their black color. They are not being offered as untreated natural-color black diamonds.

The round brilliant-cut surfaces reflect light, giving the diamonds their distinctive luster.

Certificate of Authenticity

A Certificate of Authenticity is included with your necklace. Please contact us for laboratory and certificate verification details.

Metal & Finish Information

The metal is described as stamped solid 925 sterling silver.

Available finishes include White Gold, Rose Gold, Black Gold, and Yellow Gold. The selected finish does not mean the necklace's metal components are solid gold.

The silver is described as having nickel-free rhodium plating. If you have a known metal sensitivity, please request details about the selected finish before purchasing.

Processing & Shipping

Please allow 5–7 business days for manufacturing after payment is received. The listing also states 3–7 business days for processing tasks such as finishing, packing, certification, and documentation. Please contact us to confirm the total dispatch time for your selected option.

Estimated shipping transit time is 5–9 business days after dispatch. Manufacturing and processing time are additional to transit time.

Shipping is arranged through USPS, Speed Post, FedEx, or a comparable carrier, depending on the destination and service used. Tracking information is provided after dispatch.

For USPS shipments sent from India, tracking updates may begin once the parcel reaches the United States. The listing estimates this initial tracking update at 3–5 days after dispatch.

Shipping charges:

United States: $15 USD
Other supported international destinations: $50 USD

Delivery estimates may be affected by customs clearance and carrier delays.

Combined Shipping

Up to five items can be combined in one order. Purchases exceeding five items are handled as a separate order.

Payment

We accept major credit cards and bank transfers through Wise, subject to the payment methods available for your order.

For purchases arranged outside immediate checkout, payment is requested within three days. Items remain available to other buyers until payment is received.

Customs & Import Charges

USA – All items are delivered free of customs duty, tariffs, or other charges.

Rest of the World – Import duties, customs charges, and applicable local taxes are the buyer’s responsibility unless collected at checkout or otherwise stated for the order. These charges vary by destination and are separate from the listed shipping fee.

Returns & Refunds

Items may be returned within 14 days of delivery.

Returned items must be unused, undamaged, and in their original packaging. Please contact us for return instructions and use a shipping service with tracking.

Shipping charges are non-refundable.

Under our stated refund process, refunds are issued through PayPal within 5–7 days after the returned product is received and inspected.

Manufacturing Defects

We offer a money-back guarantee for manufacturing defects, subject to our return and refund policy. Please contact us with your order details and photographs so we can review the issue.

Frequently Asked Questions

What size are the black diamonds?
The round brilliant-cut diamonds measure approximately 5 mm.

What is the diamond weight?
The approximate total diamond weight is 70 carats for the 18-inch necklace. Please contact us for the weight of any other available length.

What necklace lengths are available?
The provided specifications reference an 18-inch necklace. Please check the available product options or contact us to confirm other lengths before ordering.

Is this necklace suitable for men and women?
Yes. This tennis necklace is offered as a unisex design.

What metal is used?
The metal is described as stamped solid 925 sterling silver.

What finishes are available?
White Gold, Rose Gold, Black Gold, and Yellow Gold finishes are offered. These finish names do not indicate solid gold construction.

Are the black diamonds treated?
Yes. These diamonds are described as HPHT-treated to enhance their black color. Please review the treatment disclosure before purchasing.

Are free diamond solitaire studs included?
Free diamond solitaire studs are included as the stated special offer. Please contact us for the size, weight, and metal details of the complimentary studs.

Is a certificate included?
Yes. A Certificate of Authenticity is provided with your necklace. Contact us for laboratory and verification details.

How can I request further authenticity information?
Contact ZeeDiamonds for certificate details and information about the diamonds. For an independent assessment, consult a qualified gemological laboratory.

How should I care for the necklace?
Gently wipe with a soft cloth. For occasional cleaning, use mild soap and lukewarm water, rinse carefully, and dry thoroughly. Avoid harsh chemicals and abrasive cleaners, and store separately to protect the finish.

What if I have a question about my order or certificate?
Contact ZeeDiamonds at info@zeediamonds.com with your order number and any relevant photographs or report details. We will review your concern and help with the next steps.

5 mm Black Diamond Tennis Necklace in 925 Sterling Silver, Unisex + Free Diamond Solitaire Studs