A one-of-a-kind necklace crafted from rare "Fluorite in Quartz," featuring fluorite inclusions. Fluorite, known for emitting a soft glow when exposed to ultraviolet light or heat, has long been called "hotaru-ishi" (firefly stone). While its low hardness makes it commonly appreciated as a specimen, fluorite trapped within quartz becomes exceptionally rare, with only two known production sites worldwide and current mining being extremely difficult. This necklace features a baguette-cut quartz of high transparency, within which gentian-colored fluorite floats lightly, as if freed from gravity. The matte-finished setting allows ample light from all directions to bring out the stone's fresh, luminous brilliance. An egg-shaped round link subtly enhances the graceful expression, creating a necklace that adds just the right amount of elegance and refinement to everyday wear.
【 Ryui Monthly piece 】 Gemstones shaped by time and chance No two are the same Our designers carefully select a "fragment" of nature every month Sharing with you the design and production process until it becomes jewelry —a special collection.
material：K18YG , Fluorite in quartz
stone size：approx. 4.35ct
top size：approx. H19.2mm × W8.3mm × D6.4mm
length : approx.50cm ( Adjuster 45cm )
*Due to an expected increase in orders, production may take approximately 1 to 1.5 months longer than usual. Thank you in advance for your understanding.
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
Please feel free to contact us using the form below.
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