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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 2780.0

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
Model displaying ring sizes
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
Model displaying bracelet sizes
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.

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

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Tiffany & Co. Diamond Engagement Rings

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More than a century ago, Tiffany & Co. introduced the engagement ring as it is known today worldwide. A Tiffany diamond ring is an iconic symbol of true love and lifetime commitment. In its spectacular brilliance is the promise of the future together.
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