Oval rainbow moonstone cabochon, 7×5 mm, with flat back. The blue adularescence flash — more pronounced than in 4–5 mm rounds due to the larger light-gathering area — makes the 7×5 mm oval the reference size for earrings
Product Details
| Mineral |
Rainbow moonstone (oligoclase, sodium-calcium feldspar; commercially "rainbow moonstone") |
| Dimensions |
Approximately 7 × 5 mm. Variation of ±0.5 mm due to hand-cutting. |
| Shape and Back |
Oval, polished flat back |
| Finish |
Mirror polish |
| Hardness |
6–6.5 Mohs — we recommend closed bezel setting for daily wear |
| Origin |
India (Rajasthan) |
| Treatment |
Untreated. The blue flash is natural (adularescence) |
| Item Type |
Loose stone (price per unit); available in individual units |
This specific piece
The 7×5 mm oval is the standard reference size for moonstone jewelry bezels: it fits most pre-made settings of this dimension and is the most commonly used format
Adularescence in the 7×5 mm oval tends to show a more defined band than in smaller rounds, because the larger dimension (7 mm on the long axis) allows the point of maximum
How adularescence forms
See the full explanation in the 4 mm round product sheet. The 7×5 mm oval allows the phenomenon to be observed more clearly: when rotating the stone under pinpoint light, the blue-white band
Suitable for which mounting
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Solitaire earrings in 925 silver — the 7×5 mm oval is the ideal size for a stud earring with a standard oval bezel. The blue adularescence contrasts with bright silver for a clean, contemporary result.
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Minimalist rings — in a narrow band ring, the 7×5 mm oval is well-proportioned on fingers of all sizes. The silver oval bezel can be oxidized or left bright depending on the style.
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Accent in a pendant with a central stone — flanking a central opal or tourmaline, the two 7×5 mm oval cabochons on the sides create dynamic symmetry with the changing adularescence.
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Wire wrap — versatile format for wire wrap with an oval cage structure; the flat back provides stability to the wire structure.
Moonstone in history
See the history section in the 4 and 5 mm round product sheets for the full context.
In crystal tradition, rainbow moonstone is associated with feminine intuition, emotional clarity, and the natural flow of cycles.
The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice or a substitute for professional care.
How to recognize genuine rainbow moonstone
At 7×5 mm, the distinction is easier than in micro formats: genuine adularescence has visual depth — the blue band appears to float within the stone, not on the surface.
Frequently asked questions
Does the 7×5 mm fit standard jewelry bezels?
It is the most common reference dimension in artisanal jewelry bezels for moonstone. However, as it is hand-cut with a variation of ±0.5 mm, the jeweler should verify the fit before purchasing the setting.
Does it come with the blue flash centered?
The maximum adularescence flash is centered on the cabochon when light strikes the top face perpendicularly. When the stone is tilted, the point of maximum luminosity shifts towards the ends of the long axis.
Is it more fragile than quartz?
Yes. With 6–6.5 Mohs and cleavage in two planes, moonstone is more fragile than quartz (7 Mohs). We recommend a closed bezel for daily wear and avoiding direct impacts.
Can it be used in engagement rings or wedding bands?
It can, but with the hardness information in mind. For intense daily wear, we recommend combining it with a bezel or setting that protects the stone.
How to care for it?
Soft, slightly damp cloth. No ultrasonics, no steam, no exposure to acids or bases. The cleavage of feldspar makes the stone sensitive to angular impacts. Full guide in Care for Your Jewelry.
More rainbow moonstone: history and properties. See also: all our cabochons · handmade earrings.
