Is 0.30 ct too small for an engagement ring?

It reads as a delicate, modest ring rather than a statement stone. On a size 4.25 finger it looks proportionally larger than it would on a bigger hand.

Is F VVS1 overkill for a 0.30 ct diamond?

Largely yes. At this size most shoppers cannot see the difference between VVS1 and VS clarity, so you are paying for a grade you won't notice.

Can the ring be resized?

The listing says it can be resized, and platinum solitaires usually can go up or down a size or two. Confirm the range with the seller before buying.

How does the Etoile compare with the Tiffany Setting?

The Tiffany Setting uses a six-prong knife-edge band and is the more iconic design. The Etoile is a plainer band with a low four-prong head and usually costs less for the same stone.

What comes with the ring?

Expect the ring and, from a Tiffany stockist, the blue box and diamond certificate. Ask The Diamond Oak exactly which papers are included.

When is the best time to buy?

With only one new listing at $2,250 as of November 4, 2026, there is no sale pattern to wait for. Compare against resale Etoile listings, which often run well below new.

Tiffany & Co. Etoile Platinum Round Diamond Engagement Ring 0.30ct: 39% off at The Diamond Oak

Q: Where is the Tiffany & Co. Etoile Platinum Round Diamond Engagement Ring 0.30ct cheapest?

At The Diamond Oak, for $2,250.00, 39% off, as of our latest check.

What reviewers say

Owners of the Etoile line generally praise the clean, understated setting and the sparkle of the round brilliant, and Tiffany buyers value the brand and packaging. The common complaint is value: the same money buys a much larger stone elsewhere.

Pros

Simple, classic look that stacks with wedding bands
Bright sparkle from the round brilliant cut
Comfortable low setting for daily wear
Tiffany presentation and certification

Cons

Small carat weight for the price
Premium paid for the brand over the stone
Thin band can feel delicate to some wearers

From The Diamond Oak

Tiffany & Co. Etoile engagement ring in platinum
Round brilliant cut center diamond weighing 0.30 cts
F color, VVS1 clarity
Half bezel setting
Fully hallmarked with Tiffany logos and metal content
Diamond inscribed T&Co.E12290216

Sizes: 4.25
Materials: Platinum (PT950), bezel setting
Fit: Finger size 4.25, can be resized
Sizing: Listed finger size is 4.25 and the ring can be resized.
Guarantee: Every designer piece is rigorously inspected and authenticated; guaranteed 100% authentic or your money back.
Returns: 30 day returns: no hassle, no cost, no questions asked; item must be in same condition received and in original packaging; restocking fee of 3-6% applies (bank
Shipping: Free 1+2 day FedEx (US); same day shipping on orders received by 4:30pm EST M-F; no sales tax outside NY (U.S. orders).
In the box: Original certificate from Tiffany & Co., Original inner and outer box with white satin ribbon from Tiffany & Co.

Size chart

Sizes	Inside Diameter (in)	Inside Diameter (mm)	Inside Circumference (in	Inside Circumference (mm
0	0.458	11.63	1.44	36.5
1/4	0.466	11.84	1.46	37.2
1/2	0.474	12.04	1.49	37.8
3/4	0.482	12.24	1.51	38.5
1	0.49	12.45	1.54	39.1
1 1/4	0.498	12.65	1.56	39.7
1 1/2	0.506	12.85	1.59	40.4
1 3/4	0.514	13.06	1.61	41.0
2	0.522	13.26	1.64	41.7
2 1/4	0.53	13.46	1.67	42.3
2 1/2	0.538	13.67	1.69	42.9
2 3/4	0.546	13.87	1.72	43.6