Unknown knowns -line-

Name: Unknown knowns -line-
Brand: Ryui intl.
Price: 244000.0 JPY
Availability: InStock

Unknown knowns -line-　An asymmetrical form that traces the accumulation of time and experience like a quiet trajectory.
Subtle undulations created by layered materials form a ring surface that suggests multiple strata, while the semi-gloss finish softly catches the light.

diamond size : options available from 0.15ct
diamond grade : Standard *
ring width : approx. 1.5 mm
*These are high-quality diamonds carefully selected by us at Ryui, with almost no inclusions visible to the naked eye.
・4C grade cannot be specified (no certificate included)
・It is possible to exchange the diamond for one with a certificate starting from an additional ¥55,000 including tax. Please contact us for details.

This ring is available in the following materials: Pt900 (platinum), K18YG (yellow gold), K18WG (white gold), or K18PG (pink gold).

As a small gift to celebrate your special occasion, we present a "Migratory Bird Pin Brooch" (brass, shown in the 10th photo) to those who purchase a pair of wedding rings along with an engagement ring. This brooch features a bird motif, symbolizing good fortune.

*This ring will be made to order after receiving your order (delivery time: about 9 weeks). Please indicate your desired size.
*This ring does not support inner hand-stamped engraving or the setting of a birthstone on the inside.

¥244,000

Sale Sold out

Product variants

Regarding made-to-order and resizing items:
*Please note that during busy periods, production may take an additional 1–3 weeks beyond the usual timeframe. We appreciate your understanding.
*Due to our Kyoto Pop-up Store, in-stock items ordered between October 21 (Wed) and October 26 (Mon), 2026, will be shipped on or after October 27 (Tue). We apologize for any inconvenience and appreciate your kind understanding.

Ring Size

Ring size conversion chart

We use Japanese sizes. For international equivalents, please refer to the correspondence table below.

Perimeter (mm)	Inner diameter (mm)	Japan (JCS)	EU (JIS / ISO)	US	UK
40.8	13	1	41	1	C
41.9	13.4	2	42	2	D
42.9	13.7	3	43	2.5	E
44	14	4	44	3	F
45	14.4	5	45	3.5	G
46.1	14.7	6	46	3.5 – 4	G – H
47.1	15	7	47	4 – 4.5	H – I
48.2	15.4	8	48	4.5 – 5	I – J
49.2	15.7	9	49	5	J
50.3	16	10	50	5.5	K
51.3	16.4	11	51	6	L
52.4	16.7	12	52	6.5	L – M
53.4	17	13	53	6.5 – 7	M – N
54.5	17.4	14	54	7 – 7.5	N – O
55.5	17.7	15	55	7.5 – 8	O – P
56.5	18	16	56	8	P
57.6	18.4	17	57	8.5	Q
58.6	18.7	18	58	9	R
59.7	19	19	59	9.5	S
60.7	19.4	20	60	10	T
61.8	19.7	21	61	10 –	T – U
62.8	20	22	62	10.5	UK
63.9	20.4	23	63	11	V
64.9	20.7	24	64	11.5	W
66	21	25	65	12	X

Resizing at the time of purchase

For rings over ¥33,000 (tax included)	We offer complimentary resizing within ±3 sizes from the size in stock. If you wish to have your ring resized, please proceed to the purchase screen of the item and enter the desired size in the remarks form in the shopping cart. Production period: about 4 weeks
For rings under ¥33,000 (tax included)	We do not accept resizing from stock items. Please contact us using the inquiry form and we will make a custom order in the desired size. Production period: about 5 weeks

Selecting your ring size

We recommend choosing a size that you can comfortably wear without feeling pressure or tightness when you make a fist, and without discomfort between adjacent fingers.

For wide rings of 6.0 mm or more
Compared to the number measured with a typical ring gauge, a wide width ring may feel a little tight to wear due to its large surface area. When considering a wide ring, we recommend that you choose a slightly looser size than you usually wear, 1 to 1.5 sizes up.

Please note that some rings cannot be resized due to their design.
Please check the details on each product page.
Contact

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