The centre alexandrite is lab-grown, displaying the stunning colour-change effect from green in daylight to red/purple under incandescent light. Side diamonds are IGI certified lab-grown stones.
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3–5 Week Delivery
Every piece is made to order. We always aim to be as quick as we possibly can — but we ask for 3–5 weeks to make sure we meet your expectations.
Alexandrite Trilogy Ring
£1,650
A breathtaking trilogy ring featuring a lab-grown alexandrite centre stone flanked by brilliant-cut lab-grown diamond shoulders. The alexandrite displays a mesmerising colour-change from vivid green in daylight to rich red-purple in candlelight.
9K White Gold
9K Yellow Gold
9K Rose Gold
18K White Gold
18K Yellow Gold
18K Rose Gold
Platinum
1.0ctBase
1.5ct+£400
2.0ct+£800
3.0ct+£1,800
4.0ct+£2,800
5.0ct+£3,800
6.0ct+£4,900
7.0ct+£6,000
Select Ring Size (UK)Size Guide
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Secure Payment
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IGI Certified
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Free Insured Delivery
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30-Day Returns
Ring Size Guide
Not sure of your size? Use one of the methods below to find your perfect fit. If you're still unsure, contact us and we'll be happy to help.
Method 1 — Measure an Existing Ring
If you already own a ring that fits the correct finger, simply measure the inside diameter in millimetres and use the chart below to find your UK size.
Place the ring flat on a ruler.
Measure the inside diameter (from inner edge to inner edge) in mm.
Match your measurement to the table below.
Method 2 — Measure Your Finger
Cut a thin strip of paper or use a piece of string.
Wrap it snugly around the base of the finger you intend to wear the ring on.
Mark where the paper or string meets and measure the length in mm — this is your circumference.
Match to the table below.
💡 Tip: Fingers change size throughout the day — they're larger in the evening and when warm. We recommend measuring at the end of the day for the most accurate fit.
UK Ring Size Chart
UK Size
Inside Diameter (mm)
Circumference (mm)
US Size
D
14.9
46.8
3
E
15.3
48.0
3½
F
15.7
49.3
3¾
G
16.1
50.6
4
H
16.5
51.9
4½
I
16.9
53.1
4¾
J
17.3
54.4
5
K
17.7
55.7
5½
L
18.1
56.9
5¾
M
18.5
58.2
6
N
18.9
59.5
6½
O
19.3
60.8
6¾
P
19.7
62.0
7
Q
20.1
63.3
7½
R
20.5
64.6
7¾
S
20.9
65.9
8
T
21.3
67.1
8½
U
21.7
68.4
8¾
V
22.1
69.7
9
W
22.5
70.9
9½
X
22.9
72.2
10
Y
23.3
73.5
10½
Z
23.7
74.8
11
Not sure? We recommend ordering a half size up. All rings can be resized — contact us at andy@manxcrowndiamonds.com and we'll advise you.
