Cosima Signature Halo Ring
5.0 ct Alexandrite, Diamond, 18k Rose Gold
MSRP $5,529
Save $4,100
Alexandrite is a color changing gemstone. Each stone showcases a unique range of colors and may differ from the display item.
Indulge in the color changing properties of this lab grown alexandrite and diamond ring. A 5ct pear cut alexandrite stone sits effortlessly in the centre of this solid 18k rose gold ring. Encircled by a halo of round cut natural diamonds, totalling 0.16ct, this ring is the epitome of luxury.
Single 5ct lab grown alexandrite, 32 diamonds, 1-3/K-M, total 0.16ct. Pear cut, Available in sizes A-Z including half sizes.
Lab grown gemstones hold the same optical and physical properties as their natural counterparts and offer a superlative cut, color and clarity.
- Solid 18k rose gold (4.4 gr total)
- Setting size: 16.3 mm (0.64 in)
- Alexandrite: June's birthstone
- Perfect gift for 55th wedding anniversary
Specifications | |
---|---|
Item Code | 5842R.18 |
Gender | Women |
Metal | 18k Rose Gold |
Birthstone | June |
Anniversary | 55th Anniversary |
Setting Width | 16.3 mm |
Total Weight | 5.43 gr |
Stone 1 | |
Information | 1 pear cut lab grown alexandrite (9 x 13 mm) = 5 ct |
Stone Color | Color Changing |
Number of Stones | 1 |
Stone Dimensions | 9 x 13 mm |
Total Carat Weight | 5.0 ct |
Stone Type | Lab Grown |
Stone 2 | |
Information | 32 round cut diamonds (K color, I3 clarity) = 0.16 ct total |
Stone Color | Clear |
Diamond Color | K |
Diamond Clarity | I3 |
Number of Stones | 32 |
Total Carat Weight | 0.16 ct |
Stone Type | Natural |
With our 30 day money back guarantee, you have plenty of time to decide whether the item(s) is right for you. If you do decide to return the item, please ensure it is unused, unaltered and all jewelry tags are attached.
To arrange a return, simply contact our Customer Service team by telephone, email, live chat or our contact form. When returning an item, we always recommend you use tracked and insured delivery to be on the safe side.
+44 800 488 0888
Opening Hours: 9am-5pm (GMT), Monday-Friday. Excludes public holidays.
sales@qpjewellers.com

QP Jewellers
For moments that matter. QP Jewellers classic and refined gemstone jewelry is crafted by hand, creating wearable pieces of art with an abundance of meaning. Whether it is a special anniversary, a momentous birthday or just to show your appreciation, explore the finest natural and lab grown gemstone jewelry.
Alexandrite
Considered one of the newer gemstones, alexandrite is the other June birthstone in addition to pearl. Occasionally called the 'chameleon birthstone', this unique gemstone can be seen with both green and purple colors depending on the lighting with some referring to the stone as 'emeralds during the day and rubies at night'. An alexandrite single stone ring is favoured by many as it adds a simple yet memorable touch to an evening outfit as it shifts colors.


Complimentary Gift Packaging
There's nothing like opening jewelry for the first time. So, with QP Jewellers each piece of jewelry is gorgeously gift wrapped. Complete with a branded black presentation box, gift bag and Certificate of Authenticity, avoid the hassle of wrapping at no extra cost. All of our jewelry is shipped in discreet outer packaging, saving the surprise for the big day.
Handcrafted & Quality Assured
We use only quality materials including solid gold, white gold and sterling silver. Using only the finest ethically sourced diamonds and gemstones from fair and trusted sources, each item is carefully handcrafted by an expert team of jewellers.


Made in the USA
We're proud to confirm that all QP Jewellers designs are made here in the United States of America. Each item has been carefully crafted by our expert jewelers with an emphasis on the highest quality items.
Authenticity
As a trusted jeweler most of our designs use stones that are 100% natural. Items featuring lab created stones and cubic zirconia are clearly disclosed on our website. We use solid metals in all of our designs to ensure exceptionally high quality jewelry that lasts. None of our jewelry designs are plated.
