Size Guide

◼︎ Size Guide for International Customers

At Astrea JEWELRY and ART, each piece is carefully crafted from natural materials and delivered with attention to detail. To help you choose the best fit, we offer a detailed size guide by product category. All measurements are in millimeters (mm) or centimeters (cm), as appropriate, and based on actual dimensions.

◼︎ MINERALS (Raw & Polished Stones)

  • Dimensions are listed as: height × width × depth (in mm), using the largest points.
  • Due to natural stone irregularities, slight differences may occur.
  • Please refer to product images with hand comparison for size impression.

◼︎ Natural Stone Bracelets – Fit & Comfort

Astrea's natural stone bracelets are designed for comfortable daily wear. We recommend choosing a size that allows approximately +0.5cm to +1.0cm (approx. +0.2" to +0.4") of room beyond your wrist measurement. Preferences may vary by individual, so please choose based on your preferred fit.

◼︎ Structural Adjustments When Sizing

  • Depending on the selected size, subtle adjustments may be made to the beads near the clasp area. Typically, 1–2 beads are added or removed per 1cm change, though this may vary depending on the size of each stone.
  • Regardless of size, the types and quality of natural stones and precious metals remain consistent. For each size, we carefully select stones of the same type or complementary tone from the original design, ensuring a harmonious overall balance.
  • Each bracelet is individually handcrafted to achieve a finish that closely matches the product photos. We take great care in every detail so you can feel confident when choosing your size.

◼︎ Important Notes on Size Adjustment

  • We are unable to accommodate requests for specific bead types or arrangements.
  • Please note that returns or exchanges cannot be accepted due to minor variations or differences in appearance caused by structural adjustments.
  • If you have any questions, feel free to contact us before placing your order.

◼︎ How to Choose Your Size

  • We recommend adding approximately +1cm (approx. +0.4") to your actual wrist size for a comfortable fit.
  • For a snug fit, +0.5cm (approx. +0.2") may work, though it may feel slightly tight depending on your wrist shape.
  • For a loose fit, please avoid exceeding +1.5cm (approx. +0.6") as it may increase the risk of slipping off during movement.

◼︎ Notes on Pricing

Standard sizes (15–17cm / approx. 5.9"–6.7") and Large sizes (18–20cm / approx. 7.1"–7.9") differ in price due to varying amounts of gemstones and materials used.
Please check the size-specific pricing shown on each product page before ordering.

◼︎ Custom Sizes (Under 14cm / Over 21cm)

We offer custom sizing for wrist sizes under 14cm (approx. 5.5") or over 21cm (approx. 8.3") whenever possible.
Pricing and specifications may vary depending on design adjustments and material availability. Please contact us in advance to discuss options.

◼︎ Additional Notes on Design Consistency

Regardless of size, the quality of gemstones and types of precious metals used are consistent across all sizes.
Every bracelet is carefully crafted to maintain a beautiful and balanced appearance.

◼︎ Size Reference Table

Wrist Size (Inner Circumference) Size Label Recommended For
Under 14cm (approx. 5.5") Custom For very slim wrists or specific fit preferences.
*Please consult us in advance.
15cm / 16cm / 17cm (approx. 5.9"–6.7") XS–M These are common standard sizes among women in Japan.
Recommended for a natural, comfortable fit.
18cm / 19cm / 20cm (approx. 7.1"–7.9") L–3L Recommended for those who prefer a looser fit or international sizing.
Over 21cm (approx. 8.3") Custom For larger wrists or relaxed layering styles.
*Please consult us in advance for adjustments.
  • Fit may vary depending on individual wrist shape and preference.
  • We recommend measuring an existing bracelet with a soft tape measure.
  • A bracelet that's too tight may be difficult to put on or remove, while a loose one may slip off during movement.

◼︎ Earrings & Ear Cuffs

Earrings and ear cuffs come in a variety of shapes and sizes, and the way they feel and look can vary depending on the unique contours of your ears. Below, we outline the key size specifications and considerations to help guide your choice.

◼︎ Fit and Individual Differences

  • The fit of ear cuffs and earrings can vary greatly depending on your ear shape, thickness, and preferred wearing position.
  • Ear cuffs are typically one-size, but may feel loose or tight depending on the individual.
  • We recommend reviewing the size details and model photos on each product page for visual reference.

◼︎ Key Size Terminology & Measurements

Measurement Description
Opening Gap The space between the two ends of an ear cuff. This affects how tightly or loosely it fits around the ear.
Inner Diameter The inner circle of the ear cuff. A helpful reference for how it may sit on the cartilage.
Outer Diameter The full width including the decorative area. Gives a visual sense of scale.
Wire Thickness Thickness of the metal itself, which influences durability and comfort.
Post Thickness For pierced earrings, the diameter of the post (typically 0.7–1.0 mm).
Drop Length Total length from the piercing to the bottom of a dangle earring.
Weight Overall weight of the piece, which can affect comfort during extended wear.

◼︎ Wearing Tips & Cautions

  • Avoid forcibly pulling or widening ear cuffs, as this may lead to breakage or deformation.
  • For earrings with posts, ensure the thickness matches your piercings to avoid discomfort.
  • Slight variations in length or curvature are part of each design and do not affect quality.

◼︎ Ring Size Guide

Our rings follow the Japanese JIS standard sizing system, but we’ve provided US and metric conversions for easy reference.
If you're unsure about your size, we recommend using a ring sizer or consulting with a local jeweler.

We offer a wide range of sizes — from US 3 (suitable for pinky rings) up to US 10.
For larger or smaller custom sizes, feel free to contact us.

US Size JIS (JP Size) Inner Diameter (mm) Inner Circumference (mm)
3 5 14.1 44.2
4 7 14.8 46.5
5 9 15.7 49.2
6 11 16.5 51.8
7 14 17.3 54.4
8 16 18.2 57.0
9 18 18.9 59.3
10 20 19.8 62.2

✧ Slight variations in fit may occur due to band thickness and design. For rings with wide bands, consider sizing up slightly.

◼︎ Necklaces

Standard length is approx. 45 cm unless otherwise noted. Adjustable chains allow ±5 cm variation.

Length Style
40 cm / 15.7 in Sits at collarbone, good for layering or fine tops
45 cm / 17.7 in Standard versatile length for most styles
50–55 cm / 19.7–21.6 in Longer, ideal for layering or statement pieces

Use a soft tape measure around your neck to estimate your preferred fit. Our adjustable chains typically allow 5 cm extension (e.g., 38–43 cm).

◼︎ Still not sure?

Sizing and fit can vary by material and design. If you have specific questions or need further assistance, please refer to our FAQ page for more guidance.

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