Purchases made on this site will ship to U.S. addresses only. Do you want to shop the U.S. site?

Shop the U.S. site Or
Tiffany & Co. Tiffany & Co.

Tiffany Harmony® Round Brilliant Engagement Ring with a Diamond Platinum Band

Style # 66651
1.75 Carat

In the same way that lyrics and music effortlessly blend together, the Tiffany Harmony® engagement ring pairs perfectly with its coordinating wedding band. The delicate four-pronged setting ensures the diamond shines brilliantly above the band and is complemented by the exacting proportions and tapered diamond band of this ring that, when worn with its matching band ring, creates the perfect bridal duet.



At Tiffany, we ethically source our diamonds. Integrity and social responsibility are at the core of our sourcing practices.

Priced from 2670.0

Pricing is based on the gemological characteristics of each stone, including cut, color, clarity and carat weight. The lowest price shown reflects current inventory with your requested gemological criteria.

Ring Size Guide

US Size
Inside circumference (mm)
2
41.7
3
42.9
3.5
45.5
4
46.8
4.5
48.0
5
49.3
5.5
50.6
6
51.9
6.5
53.1
7
54.4
7.5
55.7
8
57.0
8.5
58.3
9
59.5
9.5
60.8
10
62.1
10.5
63.4
11
64.6
11.5
65.9
12
67.2
12.5
68.5
13
69.7

Find your fit

Tiffany & Co. uses standard US rings sizes. Refer to our measurement chart or the ruler found in our size guide.

View & download complete guide
Bracelets
Wrist measurements
Extra Small
4.76-5.25 in. 121-133 mm
Small
5.26-5.75 in. 134-146 mm
Medium
5.76-6.25 in. 146-159 mm
Large
6.26-6.75 in. 159-171 mm
Extra Large
6.76-7.25 in. 172-184 mm

Find your fit

Refer to our measurement chart or use the ruler found in our size guide to find the size that suits you.

View & download complete guide
Length (in)
Length (cm)
16
40.50
18
45.75
20
50.75
24
61.00
30
76.25
36
91.50

Find your fit

Necklaces vary by length and can be chosen to reflect personal preference or style.

Shipping Icon
Complimentary Shipping & Returns

Purchases made online can be returned or exchanged within 30 days, plus shipping is on us.

Payment Icon
Payment Plans

We want you to have the ring of your dreams.

Learn More
Email Product Icon
Drop a Hint

Let us tell someone special what you’re wishing for.

Tiffany Harmony® Engagement Ring

Tiffany Harmony®

The tapered four-prong setting of the Tiffany Harmony® engagement ring places the round brilliant diamond in the spotlight. The Tiffany Harmony® band ring precisely conforms to the contours of the engagement ring, resulting in a harmonious design.
Shop Engagement Rings
Tiffany & Co. Responsbily Sourced Sustainability

Responsibly Sourced

At Tiffany, we’re committed to sustainable luxury. In a significant step for diamond transparency, we now provide provenance information—region or countries of origin—for every newly sourced, individually registered diamond we set.

Learn More

Customize Your Ring

A unique love deserves a unique ring. Our experts can help you, at no additional charge, customize a ring with your choice of diamond, setting and personal inscription.

Speak to a Diamond Expert
Tiffany & Co. Customize Your Ring with a Diamond Expert
Sign out of Sales Service Mode