Corund · CR-65V · 18K gold vermeil · 18 in
Grown, not mined.
$129.00
One round laboratory-grown blue sapphire, 6.5 mm, in a smooth full bezel with an open back, on a 1.2 mm cable chain. 925 sterling silver plated with 18K gold, 2.5 microns minimum (gold vermeil). Not solid gold.
To open the clasp: hold the clasp, not the chain, and press the lever toward the hinge with your thumbnail. To choose a length for someone else: 1. lay a necklace they already wear flat on a table; 2. measure it end to end, clasp included; 3. choose the same length; the 2 in (5 cm) extender adds the rest. To store: wipe it dry and put it in the pouch.
Pendant, bail, chain, clasp, extender and tag: 925 sterling silver plated with 18K gold, 2.5 microns minimum, over a palladium barrier (gold vermeil). Stone: one laboratory-grown sapphire, corundum (Al2O3). Inside the clasp: a steel spring. Box: uncoated gray board; insert: white cotton paper; pouch: undyed cotton with a drawstring; cards: white cotton board; cloth: gray microfiber with no polishing compound; strip: paper.
Care: put it on last and take it off first; remove before swimming, showering, exercise and sleep; keep away from perfume, lotion, sweat and household chemicals; wipe with a soft dry cloth after wearing and store in the pouch. Gold plating and vermeil wear thin with time and use; replating is a normal service. When it dulls: thirty seconds with the plain cloth. Not on vermeil: silver dip, cloths with polishing compound, toothpaste, baking soda or ultrasonic baths; they take the gold layer off with the tarnish.
Adult jewelry, not a toy. Contains small parts: keep away from children.
Four details you can check
A full bezel closes the metal around the whole stone: no prongs to catch on knitwear or bend.
A round window about 3.8 mm wide behind the stone lets light in from behind and lets you wipe lotion out.
The bail is a fixed tube hidden behind the rim, so the pendant faces forward instead of turning over.
The 12 x 6 mm lobster clasp has a lever you can press with a thumbnail; hold the clasp, not the chain.
Care, as habits
Gold plating and vermeil wear thin with time and use; replating is a normal service.
One stone, three lights
A north window, about 6500 K: brighter by a window.
About 2700 K: deeper under a lamp.
About 7500 K. The same laboratory-grown sapphire, 6.5 mm; not a mined stone.
On the body
The line
 Corund One Stone, Silver |  Corund One Stone, 18K Vermeil |  Corund One Stone Set | |
|---|---|---|---|
| Metal | 925 sterling silver, stamped 925 | 925 sterling silver core | 925 sterling silver core |
| Finish or plating | Rhodium plated | 18K gold vermeil, 2.5 microns minimum | 18K gold vermeil, 2.5 microns minimum |
| Stone | Laboratory-grown sapphire, 6.5 mm | Laboratory-grown sapphire, 6.5 mm | Laboratory-grown sapphire, 6.5 mm |
| Studs | None | None | Two laboratory-grown sapphires, 5 mm each |
| Chain lengths | 16 or 18 in, plus a 2 in extender | 16 or 18 in, plus a 2 in extender | 18 in, plus a 2 in extender |
| Label cards | One | One | Two |
| Box | Slide box with a 50 mm ruler tray | Slide box with a 50 mm ruler tray | One slide box with two trays |
Questions, care and the label
A laboratory-grown sapphire: corundum, aluminum oxide, Mohs 9, grown as a crystal and then cut. Round, 6.5 mm. Its weight in ct, how it was grown, its treatment and its report number are printed on the label card in the box.
A laboratory-grown blue sapphire changes with the light. The fifth image shows the same stone under three light colors: by a north window, under a warm lamp and in open shade. Expect it brighter by day and deeper in the evening.
925 sterling silver, with a palladium barrier layer between the silver and the gold layer. The gold layer is 18K, 2.5 microns minimum: gold vermeil, not solid gold.
Silver darkens with air and sweat, and the gold layer wears thin with time and use; replating is a normal service. Put it on last, take it off first, and wipe it with the plain cloth in the box when it dulls.
Yes. Remove it before swimming, showering, exercise and sleep, and keep it away from perfume, lotion and household chemicals. Not on vermeil: silver dip, cloths with polishing compound, toothpaste or baking soda.
The stone is 6.5 mm and the pendant 8.3 mm across. The 16 in (41 cm) chain sits at the base of the neck, the 18 in (46 cm) on the collarbones; both have a 2 in (5 cm) extender. The second image shows the positions on one neck, the fourth the pendant on a fingertip.
The lobster clasp is 12 x 6 mm with a lever you can press with a thumbnail; the sixth image shows it in a hand. Unclasp it before pulling a sweater over your head: a 1.2 mm chain is jewelry, not a rope.
The stone sits in a full bezel: the metal is closed over its edge all the way round, with no prongs to catch or bend. A knock on a hard edge can still chip any cut stone.
The necklace in a slide box with a 50 mm ruler printed on the tray, a cotton pouch, the label card with the stone's report number, a metal card, a care card, a plain microfiber cloth and an anti-tarnish strip. No price inside.
Care: put it on last and take it off first; remove before swimming, showering, exercise and sleep; keep away from perfume, lotion, sweat and household chemicals; wipe with a soft dry cloth after wearing and store in the pouch. Gold plating and vermeil wear thin with time and use; replating is a normal service. When it dulls: thirty seconds with the plain cloth. Not on vermeil: silver dip, cloths with polishing compound, toothpaste, baking soda or ultrasonic baths; they take the gold layer off with the tarnish.
Pendant, bail, chain, clasp, extender and tag: 925 sterling silver plated with 18K gold, 2.5 microns minimum, over a palladium barrier (gold vermeil). Stone: one laboratory-grown sapphire, corundum (Al2O3). Inside the clasp: a steel spring. Box: uncoated gray board; insert: white cotton paper; pouch: undyed cotton with a drawstring; cards: white cotton board; cloth: gray microfiber with no polishing compound; strip: paper.
Adult jewelry, not a toy. Contains small parts: keep away from children.
Concept project. Fictional brand, scenes visualized with AI. People in the photos are AI-generated.
About Corund
Corund comes from corundum, the mineral our stones are made of: aluminum oxide, Mohs 9. The mineral comes before our name. Each Corund piece holds one laboratory-grown sapphire in a plain bezel and ships with a label card, the way a mineral is labeled in a collection: the stone, how it was grown, its size and weight, and the number of its report. The metal is labeled the same way, in microns. If a fact is on the label, you can check it.