Square Ring in Black
7-day returns
About This Piece
The Square Ring introduces geometric discipline to organic form by layering a square profile over smoothly curved ceramic volume. While maintaining a soft, comfortable mass against the hand, the upper plane is gently sculpted into a soft square—creating an intriguing dialogue between straight lines and rounded contours that shifts depending on the viewing angle.
In the Black edition, an ink-deep, light-absorbing black glaze envelops the curves with total uniformity, stripping away extraneous noise to leave only the purity of the silhouette. Free of pattern or distraction, the monochromatic surface accentuates the ring's subtle vitreous sheen and fluid contours. Soft light glides across the dark face from every angle, allowing this dense, solid black to showcase the sculptural architecture of the Square Ring in its most uncompromised, restrained state.
Material & Care
Material
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Glazed Ceramic / High-Fired Porcelain
Care Instructions
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Handling: As a fine ceramic object, handle with care. Avoid impact with hard surfaces or drops onto stone or tile, as this can result in chipping or cracking.
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Cleaning: Gently wipe clean with a soft, damp microfiber cloth. Do not use abrasive cleaners or rough polishing cloths.
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Storage: Store individually in a padded pouch or soft-lined compartment away from hard metal jewelry and sharp objects.
Size & Fit
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Standard Size Options: Size 11 / Size 13 / Size 15 / Size 17 / Size 20 / Size 23
| Size (KR) | Inside Diameter | US Equivalent |
| Size 11 | 16.33 mm | US 6 |
| Size 13 | 17.00 mm | US 6.5 – 7 |
| Size 15 | 17.66 mm | US 7.5 |
| Size 17 | 18.33 mm | US 8 – 8.25 |
| Size 20 | 19.33 mm | US 9.5 |
| Size 23 | 20.33 mm | US 10.5 – 10.75 |
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Ceramic Sizing Note: Due to the artisanal ceramic firing process, glaze thickness, and natural kiln shrinkage, slight dimensional tolerances may occur. Please consider this natural variation when placing your order.
Shipping & Delivery
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Processing & Lead Time: This piece is made-to-order / fulfilled through our regular production schedule. Please allow 2–3 weeks for order fulfillment and delivery. All orders are carefully processed and shipped from Seoul.
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Tracking details will be shared via email as soon as your dispatch is underway.
shipping & returns
We currently ship within the United States. Delivery usually takes 7–14 business days. Pieces marked Made to order are made after you order and can take up to 30 days to arrive. Shipping is calculated at checkout.
Returns are accepted within 7 days of delivery for unworn pieces with tags and original packaging. To start a return, sign in to your account, open your order and select Request return. Questions: hello [at] posmoa [dot] nyc.
Brand story
Oikeiosis Museum
Oikeiosis Museum explores the relationship between the objects we choose and the identities we create. Through handcrafted ceramic jewelry and everyday objects, the brand celebrates the intimate connections we form with the things we keep close.
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