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costerdiamonds.com

https://costerdiamonds.com· First analyzed 03 Jun 2026· Updated 02 Jun 2026
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costerdiamonds.com
Desktop screenshot of costerdiamonds.com
Mobile screenshot of costerdiamonds.com
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

172.67.177.100

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

CDN

Cloudflare

WAF

Cloudflare

Nameservers

chase.ns.cloudflare.com.sharon.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
501 ms10%
Speed Index
651 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
865 KB
130 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Hybrid
⚙️ SSR
Frontend
Framework
Nuxt.js
CMS
Shopify
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

8 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Facebook Pixel

Meta Frameworks

1
Nuxt.js

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Email Marketing

1
ActiveCampaign

Customer Support

1
Tidio

SEO Analysis

B78/100
22
7
0
Meta Tags15/15
Content10/12
Headings6/8
Technical19/25
E-E-A-T2/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
C
costerdiamonds.comcosterdiamonds.com

Royal Coster Diamonds: Certified Diamonds & Fine Jewelry

Discover handcrafted diamond jewelry at Royal Coster Diamonds Amsterdam. Explore certified GIA and IGI diamonds, iconic heritage, and timeless craftsmanship.

Title Length56 chars

Recommended: 50-60 chars (~338px / 580px)

Description Length157 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    910 URLs

    robots.txt

    8 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    24/100
    Needs Work
    6 11

    Sponsored

    AI & LLM Readiness

    F38/100
    Bot Access
    20/25
    Machine Read.
    7/25
    Schema Data
    2/25
    Citation
    9/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    Text ratio:3%
    Words:2,038
    Token eff.:Optimal

    Structured Data

    1 JSON-LD
    Organization×1.1

    Citation Readiness

    Opening Summary100w
    Descriptive Headings
    Canonical URL
    Open Graph2/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
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    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    88/100
    15
    Passed
    2
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    18/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
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    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    57/100
    B
    87 mg
    CO₂e / view
    864.9 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    100 mg
    vs
    Returning (cached)
    50 mg
    Annual (10K/mo)
    10.5 kg
    Emission Segments
    Data Center
    4 mg
    Network
    26 mg
    Device
    57 mg
    Resource Breakdown
    JavaScript
    396.5 KB
    Images
    93.8 KB
    CSS
    112.1 KB
    HTML
    262.1 KB
    Other
    388 B
    Green Hosting Verified
    Cloudflare
    GWF Verified
    5 recommendations
    • •Carbon footprint recommendation preview...
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    D

    Security Score

    56%Poor
    Interactive

    HTTPS

    No WAF

    84d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    28.05.2026

    Valid Until

    26.08.2026

    Subject Alternative Names (4)

    royalcoster.comshop.royalcoster.comshop2.royalcoster.comwww.royalcoster.com

    SHA-256 Fingerprint

    D3:4B:6F:46:CA:0C:B0:95:CE:9A:93:70:49:83:F8:E0:EA:4F:CC:E5...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=2592000
    built-by
    Snakeware
    content-length
    268124
    content-type
    text/html;charset=utf-8
    date
    Tue, 02 Jun 2026 23:59:43 GMT
    strict-transport-security
    max-age=315360000; preload
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    90

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (1)

    costerdiamonds-com.mail.protection.outlook.com

    Domain Information

    costerdiamonds.com

    Domain Age
    29y 1m

    Created

    14.04.1997

    Expires

    15.04.2027

    Last Updated

    16.04.2026

    Registrar

    Cronon GmbH

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    Privacy policy page linked
    Legitimate interest basis mentioned

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    B
    76/100
    Mobile Friendly117 breakpoints
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
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    Typography & Readability

    Clarika Geometric

    WCAG Partial
    72/100
    Readability
    /30
    24/30

    18px · LH 1.56

    Hierarchy
    /20
    16/20

    3.11x ratio

    WCAG
    /25
    14/25

    2.74:1 min contrast

    Performance
    /25
    18/25

    1 font · 4 req

    Heading Font

    Clarika Geometric

    Sans56px

    Body Font

    Clarika Geometric

    Sans18px

    Contrast Ratio

    2.74:1

    6 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    56px
    h1
    48px
    h2
    40px
    h3
    32px
    h4
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.56 ratio (ideal range 1.4–1.6).

    ⚠️ Hard to read: Flesch score 42/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 2.7:1).

    ⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 3.1x larger than body text.

    Buy on MyFontsFlesch 42

    Color Palette

    6 unique colors
    Light
    #ffffff
    Background· 50.9%
    #110b08
    Primary· 16.7%
    #261710
    Secondary· 15.399999999999999%
    #ad9c77
    Secondary· 9.9%
    #5e4c44
    Secondary· 3.8%
    #ddd9d1
    Secondary· 3.4%

    Business & Marketing Stack

    6 Tools Detected

    Enterprise

    Marketing Automation

    1
    ActiveCampaignMid-Market

    Email marketing and automation platforms

    Customer Support

    1
    TidioSMB

    Live chat and helpdesk tools

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    Facebook PixelMid-Market

    Ad platforms and retargeting pixels

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    5

    Categories

    6

    Total Tools

    0

    Enterprise

    3

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    20 Resources

    10
    Scripts
    10
    Styles
    7
    Async
    0
    Defer

    Top Script Sources

    googletagmanager.com(3)consent.cookiebot.com(2)connect.facebook.net(2)local(1)costerdiamonds.activehosted.com(1)

    Website Identity

    Royal Coster Diamonds

    Organization
    royalcoster.com
    29 years old
    Location detected: 🇨🇦 Canadavia ip
    Cronon GmbH📧 Microsoft 365en

    Sponsored

    Last analyzed: 02 Jun 2026 at 23:59

    Historical Analysis & Change Tracking