高級ジュエリーブランドの指輪サイズ選び：ティファニー・カルティエ・パンドラ・ブルガリ

When investing in high-end jewelry from world-renowned luxury houses like Tiffany & Co., Cartier, Pandora, or Bvlgari, precision sizing is paramount. A small discrepancy can lead to discomfort or expensive resizing costs—especially for intricate, engraved, or diamond-paved collections.

Each major luxury maison has its own historical sizing heritage and craftsmanship conventions. Here is how the most iconic jewelry brands size their rings and how to guarantee a flawless fit.

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1. Cartier Ring Sizing (French & European Scale)

Cartier uses the European sizing scale (ISO circumference standard). A Cartier size 52 corresponds directly to a finger circumference of 52.0 mm (equivalent to US size 6).

• The Cartier Love Ring: The classic Cartier Love Band (5.5mm width) fits slightly snugger than narrow rings due to its solid cylindrical profile. Many Cartier specialists recommend going one size up (e.g., European size 53 instead of 52) for wider Love models, especially in warmer climates.
• The Cartier Trinity Ring: Because the Trinity features three interlocking bands that roll dynamically over the knuckle, it generally fits true to size or slightly looser. Cartier recommends ordering your standard European finger size.

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2. Tiffany & Co. Sizing (Standard US Scale)

Tiffany & Co. follows the standard US numerical scale (Sizes 3 to 13), offering full, half, and quarter sizes for high jewelry.

• Tiffany Solitaires & Engagement Rings: Solitaire settings like the legendary Tiffany Setting® can be resized by Tiffany's master bench jewelers up or down by approximately 2 sizes.
• Tiffany T True & Lock Rings: Wide geometric bands have less flexibility and should be sized half a size larger if you prefer a relaxed fit.

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3. Pandora Ring Sizing

Pandora uses unique even-numbered European sizes (48, 50, 52, 54, 56, 58, 60).

• Stacking Rings: If you are stacking 3 or more Pandora bands on the same finger, size up one Pandora size (e.g., from 52 to 54) to ensure comfortable circulation.

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4. Bvlgari (Bulgari) Ring Sizing

Bvlgari utilizes the Italian/European sizing standard. The iconic B.zero1 collection features an internal spiral mechanism.

• B.zero1 4-Band or 5-Band Rings: These signature architectural pieces do not compress or give. Always size up by 1 to 1.5 European sizes for multi-band B.zero1 models.

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Golden Rules Before Buying Luxury Rings