Engagement Rings

Halo Engagement Rings

Micropavé Oval Diamond Halo Bridal Set - Two Tone Yellow Gold

Micropavé Oval Diamond Halo Bridal Set - Two Tone Yellow Gold from £2,658.00

Micropavé Oval Diamond Halo Bridal Set - Two Tone Rose Gold

Micropavé Oval Diamond Halo Bridal Set - Two Tone Rose Gold £2,994.00

Micropavé Oval Diamond Halo Bridal Set - Yellow Gold

Micropavé Oval Diamond Halo Bridal Set - Yellow Gold from £2,598.00

Micropavé Oval Diamond Halo Bridal Set - Rose Gold

Micropavé Oval Diamond Halo Bridal Set - Rose Gold £2,934.00

Micropavé Oval Diamond Halo Bridal Set

Micropavé Oval Diamond Halo Bridal Set from £2,598.00

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Yellow Gold

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Yellow Gold from £2,658.00

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Rose Gold

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Rose Gold £2,994.00

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Rose Gold

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Rose Gold £2,934.00

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Yellow Gold

Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Yellow Gold from £2,598.00

Micropavé Round Brilliant Cut Diamond Halo Bridal Set

Micropavé Round Brilliant Cut Diamond Halo Bridal Set from £2,598.00

Micropavé Oval Diamond Halo Engagement Ring - Two Tone Yellow Gold

Micropavé Oval Diamond Halo Engagement Ring - Two Tone Yellow Gold from £1,659.00

Micropavé Oval Diamond Halo Engagement Ring - Two Tone Rose Gold

Micropavé Oval Diamond Halo Engagement Ring - Two Tone Rose Gold £1,859.00

Micropavé Oval Diamond Halo Engagement Ring - Rose Gold

Micropavé Oval Diamond Halo Engagement Ring - Rose Gold £1,799.00

Micropavé Oval Diamond Halo Engagement Ring

Micropavé Oval Diamond Halo Engagement Ring from £1,599.00

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Yellow Gold

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Yellow Gold from £1,599.00

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Yellow Gold

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Yellow Gold from £1,659.00

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Rose Gold

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Rose Gold £1,859.00

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Rose Gold

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Rose Gold £1,799.00

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring

Micropavé Round Brilliant Cut Diamond Halo Engagement Ring from £1,599.00

Petite Micropavé Oval Diamond Halo Bridal Set - Two Tone Yellow Gold

Petite Micropavé Oval Diamond Halo Bridal Set - Two Tone Yellow Gold from £2,134.00

Petite Micropavé Oval Diamond Halo Bridal Set - Two Tone Rose Gold

Petite Micropavé Oval Diamond Halo Bridal Set - Two Tone Rose Gold £2,420.00

Petite Micropavé Oval Diamond Halo Bridal Set - Yellow Gold

Petite Micropavé Oval Diamond Halo Bridal Set - Yellow Gold from £1,889.00

Petite Micropavé Oval Diamond Halo Bridal Set - Rose Gold

Petite Micropavé Oval Diamond Halo Bridal Set - Rose Gold £2,180.00

Petite Micropavé Oval Diamond Halo Bridal Set

Petite Micropavé Oval Diamond Halo Bridal Set from £2,064.00

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Yellow Gold from £2,134.00

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Two Tone Rose Gold £2,420.00

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Rose Gold £2,180.00

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set - Yellow Gold from £1,889.00

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set

Petite Micropavé Round Brilliant Cut Diamond Halo Bridal Set from £2,064.00

Petite Micropavé Oval Diamond Halo Engagement Ring

Petite Micropavé Oval Diamond Halo Engagement Ring from £1,099.00

Petite Micropavé Oval Diamond Halo Engagement Ring - Rose Gold

Petite Micropavé Oval Diamond Halo Engagement Ring - Rose Gold £1,325.00

Petite Micropavé Oval Diamond Halo Engagement Ring - Yellow Gold

Petite Micropavé Oval Diamond Halo Engagement Ring - Yellow Gold from £1,090.00

Petite Micropavé Oval Diamond Halo Engagement Ring - Two Tone Yellow Gold

Petite Micropavé Oval Diamond Halo Engagement Ring - Two Tone Yellow Gold from £1,335.00

Petite Micropavé Oval Diamond Halo Engagement Ring - Two Tone Rose Gold

Petite Micropavé Oval Diamond Halo Engagement Ring - Two Tone Rose Gold £1,465.00

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Rose Gold £1,465.00

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Two Tone Yellow Gold from £1,335.00

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Rose Gold £1,325.00

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring from £1,099.00

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Halo Engagement Ring - Yellow Gold from £1,090.00

Pavé Cushion Cut Diamond Halo Bridal Set - Rose Gold

Pavé Cushion Cut Diamond Halo Bridal Set - Rose Gold £2,180.00

Pavé Cushion Cut Diamond Halo Bridal Set - Yellow Gold

Pavé Cushion Cut Diamond Halo Bridal Set - Yellow Gold from £1,889.00

Pavé Cushion Cut Diamond Halo Engagement Ring - Yellow Gold

Pavé Cushion Cut Diamond Halo Engagement Ring - Yellow Gold from £1,090.00

Pavé Cushion Cut Diamond Halo Engagement Ring - Rose Gold

Pavé Cushion Cut Diamond Halo Engagement Ring - Rose Gold £1,225.00

Pavé Oval Diamond Halo Bridal Set - Yellow Gold

Pavé Oval Diamond Halo Bridal Set - Yellow Gold from £1,889.00

Pavé Oval Diamond Halo Bridal Set - Rose Gold

Pavé Oval Diamond Halo Bridal Set - Rose Gold £2,180.00

Pavé Oval Diamond Halo Engagement Ring - Yellow Gold

Pavé Oval Diamond Halo Engagement Ring - Yellow Gold from £1,090.00

Pavé Oval Diamond Halo Engagement Ring - Rose Gold

Pavé Oval Diamond Halo Engagement Ring - Rose Gold £1,225.00

Pavé Round Brilliant Diamond Halo Engagement Ring - Two Tone Rose Gold

Pavé Round Brilliant Diamond Halo Engagement Ring - Two Tone Rose Gold £1,465.00

Pavé Round Brilliant Diamond Halo Engagement Ring - Two Tone Yellow Gold

Pavé Round Brilliant Diamond Halo Engagement Ring - Two Tone Yellow Gold from £1,335.00

Pavé Round Brilliant Diamond Halo Bridal Set - Two Tone Yellow Gold

Pavé Round Brilliant Diamond Halo Bridal Set - Two Tone Yellow Gold from £2,134.00

Classic Engagement Rings

Carrée Solitaire Radiant Cut Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Radiant Cut Diamond Engagement Ring - Yellow Gold from £350.00

Carrée Solitaire Radiant Cut Diamond Engagement Ring - Rose Gold

Carrée Solitaire Radiant Cut Diamond Engagement Ring - Rose Gold £490.00

Carrée Solitaire Cushion Cut Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Cushion Cut Diamond Engagement Ring - Yellow Gold from £350.00

Star Solitaire Marquise Diamond Engagement Ring - Rose Gold

Star Solitaire Marquise Diamond Engagement Ring - Rose Gold £490.00

Star Solitaire Marquise Diamond Engagement Ring - Yellow Gold

Star Solitaire Marquise Diamond Engagement Ring - Yellow Gold from £350.00

Star Solitaire Marquise Diamond Engagement Ring

Star Solitaire Marquise Diamond Engagement Ring from £350.00

Carrée Solitaire Princess Cut Diamond Engagement Ring

Carrée Solitaire Princess Cut Diamond Engagement Ring from £350.00

Carrée Solitaire Princess Cut Diamond Engagement Ring - Rose Gold

Carrée Solitaire Princess Cut Diamond Engagement Ring - Rose Gold £490.00

Carrée Solitaire Princess Cut Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Princess Cut Diamond Engagement Ring - Yellow Gold from £350.00

Carrée Solitaire Oval Diamond Engagement Ring - Rose Gold

Carrée Solitaire Oval Diamond Engagement Ring - Rose Gold £490.00

Carrée Solitaire Oval Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Oval Diamond Engagement Ring - Yellow Gold from £350.00

Carrée Solitaire Emerald Cut Diamond Engagement Ring

Carrée Solitaire Emerald Cut Diamond Engagement Ring from £350.00

Carrée Solitaire Round Brilliant Engagement Ring

Carrée Solitaire Round Brilliant Engagement Ring from £350.00

Carrée Solitaire Princess Cut Diamond Bridal Set - Rose Gold

Carrée Solitaire Princess Cut Diamond Bridal Set - Rose Gold £1,625.00

Carrée Solitaire Princess Cut Diamond Bridal Set - Yellow Gold

Carrée Solitaire Princess Cut Diamond Bridal Set - Yellow Gold from £1,349.00

Carrée Solitaire Princess Cut Diamond Bridal Set

Carrée Solitaire Princess Cut Diamond Bridal Set from £1,349.00

Carrée Solitaire Emerald Cut Diamond Bridal Set - Yellow Gold

Carrée Solitaire Emerald Cut Diamond Bridal Set - Yellow Gold from £1,349.00

Carrée Solitaire Emerald Cut Diamond Bridal Set - Rose Gold

Carrée Solitaire Emerald Cut Diamond Bridal Set - Rose Gold £1,625.00

Carrée Solitaire Emerald Cut Diamond Bridal Set

Carrée Solitaire Emerald Cut Diamond Bridal Set from £1,349.00

Carrée Solitaire Emerald Cut Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Emerald Cut Diamond Engagement Ring - Yellow Gold from £350.00

Carrée Solitaire Cushion Cut Diamond Bridal Set

Carrée Solitaire Cushion Cut Diamond Bridal Set from £1,349.00

Carrée Solitaire Cushion Cut Diamond Bridal Set - Rose Gold

Carrée Solitaire Cushion Cut Diamond Bridal Set - Rose Gold £1,625.00

Carrée Solitaire Cushion Cut Diamond Bridal Set - Yellow Gold

Carrée Solitaire Cushion Cut Diamond Bridal Set - Yellow Gold from £1,349.00

Carrée Solitaire Oval Diamond Bridal Set

Carrée Solitaire Oval Diamond Bridal Set from £1,349.00

Carrée Solitaire Oval Diamond Bridal Set - Rose Gold

Carrée Solitaire Oval Diamond Bridal Set - Rose Gold £1,625.00

Carrée Solitaire Oval Diamond Bridal Set - Yellow Gold

Carrée Solitaire Oval Diamond Bridal Set - Yellow Gold from £1,349.00

Carrée Solitaire Oval Diamond Engagement Ring

Carrée Solitaire Oval Diamond Engagement Ring from £350.00

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set from £1,349.00

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set - Yellow Gold

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set - Yellow Gold from £1,349.00

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set - Rose Gold

Carrée Solitaire Round Brilliant Cut Diamond Bridal Set - Rose Gold £1,625.00

Star Solitaire Round Brilliant Bridal Set - Rose Gold

Star Solitaire Round Brilliant Bridal Set - Rose Gold £1,625.00

Star Solitaire Round Brilliant Bridal Set - Yellow Gold

Star Solitaire Round Brilliant Bridal Set - Yellow Gold from £1,349.00

Star Solitaire Round Brilliant Diamond Engagement Ring - Yellow Gold

Star Solitaire Round Brilliant Diamond Engagement Ring - Yellow Gold from £350.00

Carrée Solitaire Round Brilliant Engagement Ring - Rose Gold

Carrée Solitaire Round Brilliant Engagement Ring - Rose Gold £490.00

Carrée Solitaire Cushion Cut Diamond Engagement Ring - Rose Gold

Carrée Solitaire Cushion Cut Diamond Engagement Ring - Rose Gold £490.00

Carrée Solitaire Cushion Cut Diamond Engagement Ring

Carrée Solitaire Cushion Cut Diamond Engagement Ring from £350.00

Carrée Solitaire Emerald Cut Diamond Engagement Ring - Rose Gold

Carrée Solitaire Emerald Cut Diamond Engagement Ring - Rose Gold £490.00

Carrée Solitaire Round Brilliant Diamond Engagement Ring - Yellow Gold

Carrée Solitaire Round Brilliant Diamond Engagement Ring - Yellow Gold from £350.00

Star Solitaire Round Brilliant Diamond Engagement Ring - Rose Gold

Star Solitaire Round Brilliant Diamond Engagement Ring - Rose Gold £490.00

Star Solitaire Round Brilliant Diamond Engagement Ring

Star Solitaire Round Brilliant Diamond Engagement Ring from £350.00

Diamond Set Engagement Rings

Carrée Micropavé Radiant Cut Diamond Bridal Set - Yellow Gold

Carrée Micropavé Radiant Cut Diamond Bridal Set - Yellow Gold from £1,884.00

Pavé Radiant Cut Diamond Engagement Ring

Pavé Radiant Cut Diamond Engagement Ring from £859.00

Pavé Radiant Cut Diamond Engagement Ring - Rose Gold

Pavé Radiant Cut Diamond Engagement Ring - Rose Gold £1,199.00

Carrée Micropavé Radiant Cut Diamond Bridal Set - Rose Gold

Carrée Micropavé Radiant Cut Diamond Bridal Set - Rose Gold £2,134.00

Carrée Micropavé Radiant Cut Diamond Bridal Set

Carrée Micropavé Radiant Cut Diamond Bridal Set from £1,884.00

Carrée Micropavé Radiant Cut Diamond Engagement Ring

Carrée Micropavé Radiant Cut Diamond Engagement Ring from £885.00

Carrée Micropavé Radiant Cut Diamond Engagement Ring - Rose Gold

Carrée Micropavé Radiant Cut Diamond Engagement Ring - Rose Gold £999.00

Carrée Micropavé Radiant Cut Diamond Engagement Ring - Yellow Gold

Carrée Micropavé Radiant Cut Diamond Engagement Ring - Yellow Gold from £885.00

Petite Micropavé Pear Diamond Engagement Ring - Rose Gold

Petite Micropavé Pear Diamond Engagement Ring - Rose Gold £855.00

Petite Micropavé Pear Diamond Engagement Ring - Yellow Gold

Petite Micropavé Pear Diamond Engagement Ring - Yellow Gold from £635.00

Petite Micropavé Pear Diamond Engagement Ring

Petite Micropavé Pear Diamond Engagement Ring from £635.00

Pavé Pear Diamond Bridal Set - Rose Gold

Pavé Pear Diamond Bridal Set - Rose Gold £2,024.00

Pavé Pear Diamond Bridal Set - Yellow Gold

Pavé Pear Diamond Bridal Set - Yellow Gold from £1,558.00

Pavé Pear Diamond Bridal Set

Pavé Pear Diamond Bridal Set from £1,558.00

Pavé Pear Diamond Engagement Ring - Rose Gold

Pavé Pear Diamond Engagement Ring - Rose Gold £1,199.00

Pavé Pear Diamond Engagement Ring - Yellow Gold

Pavé Pear Diamond Engagement Ring - Yellow Gold from £859.00

Pavé Pear Diamond Engagement Ring

Micropavé Pear Diamond Bridal Set

Micropavé Pear Diamond Bridal Set - Rose Gold

Micropavé Pear Diamond Engagement Ring - Yellow Gold

Micropavé Pear Diamond Engagement Ring

Micropavé Pear Diamond Engagement Ring - Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Yellow Gold from £635.00

Star Petite Micropavé Marquise Diamond Engagement Ring - Rose Gold

Star Petite Micropavé Marquise Diamond Engagement Ring - Rose Gold £855.00

Star Petite Micropavé Marquise Diamond Engagement Ring - Yellow Gold

Star Petite Micropavé Marquise Diamond Engagement Ring - Yellow Gold from £635.00

Star Petite Micropavé Marquise Diamond Engagement Ring

Star Petite Micropavé Marquise Diamond Engagement Ring from £635.00

Star Petite Micropavé Marquise Diamond Bridal Set - Yellow Gold

Star Petite Micropavé Marquise Diamond Bridal Set - Yellow Gold from £1,434.00

Star Petite Micropavé Marquise Diamond Bridal Set - Rose Gold

Star Petite Micropavé Marquise Diamond Bridal Set - Rose Gold £1,810.00

Star Petite Micropavé Marquise Diamond Bridal Set

Star Petite Micropavé Marquise Diamond Bridal Set from £1,434.00

Petite Micropavé Cushion Cut Diamond Bridal Set - Yellow Gold

Petite Micropavé Cushion Cut Diamond Bridal Set - Yellow Gold from £1,434.00

Petite Micropavé Cushion Cut Diamond Bridal Set - Rose Gold

Petite Micropavé Cushion Cut Diamond Bridal Set - Rose Gold £1,810.00

Petite Micropavé Cushion Cut Diamond Bridal Set

Petite Micropavé Cushion Cut Diamond Bridal Set from £1,434.00

Petite Micropavé Cushion Cut Diamond Engagement Ring

Petite Micropavé Cushion Cut Diamond Engagement Ring from £635.00

Petite Micropavé Cushion Cut Diamond Engagement Ring - Yellow Gold

Petite Micropavé Cushion Cut Diamond Engagement Ring - Yellow Gold from £635.00

Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Rose Gold £1,810.00

Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Yellow Gold

Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Yellow Gold from £1,434.00

Petite Micropavé Round Brilliant Cut Diamond Bridal Set

Petite Micropavé Round Brilliant Cut Diamond Bridal Set from £1,434.00

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Rose Gold

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Rose Gold £855.00

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring

Petite Micropavé Round Brilliant Cut Diamond Engagement Ring from £635.00

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Rose Gold

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Rose Gold £1,810.00

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Yellow Gold

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set - Yellow Gold from £1,434.00

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set

Star Petite Micropavé Round Brilliant Cut Diamond Bridal Set from £1,434.00

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Rose Gold

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Rose Gold £855.00

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Yellow Gold

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring - Yellow Gold from £635.00

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring

Star Petite Micropavé Round Brilliant Cut Diamond Engagement Ring from £635.00

Petite Micropavé Emerald Cut Diamond Bridal Set - Rose Gold

Petite Micropavé Emerald Cut Diamond Bridal Set - Rose Gold £1,810.00

Petite Micropavé Emerald Cut Diamond Bridal Set - Yellow Gold

Petite Micropavé Emerald Cut Diamond Bridal Set - Yellow Gold from £1,434.00

Petite Micropavé Emerald Cut Diamond Engagement Ring - Rose Gold

Petite Micropavé Emerald Cut Diamond Engagement Ring - Rose Gold £855.00

UK / Australia / South Africa	US / Canada	France	Germany / Russia / Ukraine / Asia	Italy / Spain / Netherlands / Switzerland	Japan / India / China / South America / Turkey / Israel
H	4	46.5	15	6.5	7
I	4.5	47.75	15.25	7.75	8
J	4.75	48.375	15.5	8.375	-
K	5.25	49.625	16	9.625	-
L	5.75	50.875	-	10.875	11
M	6.25	52.125	16.75	12.125	-
N	6.75	53.375	-	13.375	-
O	7	54	17.25	14	14
P	7.5	55.25	17.75	15.25	15
Q	8	56.5	-	16.5	16
R	8.5	57.75	18.5	17.75	17
S	9	59	19	19	18
T	9.75	60.875	-	20.875	19
U	10.25	62.125	20	22.125	-
V	10.75	63.375	20.5	23.375	21
W	11.25	64.625	-	24.625	-
X	11.75	65.875	21.25	25.875	-
Y	12	66.5	21.5	26.5	25
Z	12.5	67.75	21.75	27.75	26

Yes To The Perfect Diamond Ring

Halo Engagement Rings

Classic Engagement Rings

Diamond Set Engagement Rings

Choose Your Perfect Diamond

Impeccable Quality & Craftsmanship

❤️️ From Our Clients

Yes To The Perfect Diamond Ring

Halo Engagement Rings

Classic Engagement Rings

Diamond Set Engagement Rings

Choose Your Perfect Diamond

Impeccable Quality & Craftsmanship

❤️️ From Our Clients

Ring Size Conversion